diff --git a/public/images/items.json b/public/images/items.json
index 779823d12932..05d021b6a061 100644
--- a/public/images/items.json
+++ b/public/images/items.json
@@ -3416,12 +3416,12 @@
 					"rotated": false,
 					"trimmed": true,
 					"sourceSize": {
-						"w": 24,
-						"h": 24
+						"w": 32,
+						"h": 32
 					},
 					"spriteSourceSize": {
-						"x": 1,
-						"y": 2,
+						"x": 5,
+						"y": 7,
 						"w": 22,
 						"h": 19
 					},
@@ -8415,6 +8415,6 @@
 	"meta": {
 		"app": "https://www.codeandweb.com/texturepacker",
 		"version": "3.0",
-		"smartupdate": "$TexturePacker:SmartUpdate:934ea4080bad980d4fea720cc771f133:ed564bc47b79b15a763de57045178e88:110e074689c9edd2c54833ce2e4d9270$"
+		"smartupdate": "$TexturePacker:SmartUpdate:9ef21166268f7487fc9ff8d0f9b996e4:82658ac7bdd4c2b417e1f59168179262:110e074689c9edd2c54833ce2e4d9270$"
 	}
 }
diff --git a/public/images/items.png b/public/images/items.png
index 5f032b30cfb0..8aaa0281c008 100644
Binary files a/public/images/items.png and b/public/images/items.png differ
diff --git a/public/images/items/black_sludge.png b/public/images/items/black_sludge.png
index 39684a403108..37aa31de43ea 100644
Binary files a/public/images/items/black_sludge.png and b/public/images/items/black_sludge.png differ
diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 0d482a5f1a58..096a84dde3d4 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -86,7 +86,7 @@ import { ToggleDoublePositionPhase } from "#app/phases/toggle-double-position-ph
 import { TurnInitPhase } from "#app/phases/turn-init-phase";
 import { ShopCursorTarget } from "#app/enums/shop-cursor-target";
 import MysteryEncounter from "#app/data/mystery-encounters/mystery-encounter";
-import { allMysteryEncounters, ANTI_VARIANCE_WEIGHT_MODIFIER, AVERAGE_ENCOUNTERS_PER_RUN_TARGET, BASE_MYSTERY_ENCOUNTER_SPAWN_WEIGHT, MYSTERY_ENCOUNTER_SPAWN_MAX_WEIGHT, mysteryEncountersByBiome, WEIGHT_INCREMENT_ON_SPAWN_MISS } from "#app/data/mystery-encounters/mystery-encounters";
+import { allMysteryEncounters, ANTI_VARIANCE_WEIGHT_MODIFIER, AVERAGE_ENCOUNTERS_PER_RUN_TARGET, BASE_MYSTERY_ENCOUNTER_SPAWN_WEIGHT, MYSTERY_ENCOUNTER_SPAWN_MAX_WEIGHT, mysteryEncountersByBiome } from "#app/data/mystery-encounters/mystery-encounters";
 import { MysteryEncounterSaveData } from "#app/data/mystery-encounters/mystery-encounter-save-data";
 import { MysteryEncounterType } from "#enums/mystery-encounter-type";
 import { MysteryEncounterTier } from "#enums/mystery-encounter-tier";
@@ -1207,12 +1207,10 @@ export default class BattleScene extends SceneBase {
 
       // Check for mystery encounter
       // Can only occur in place of a standard (non-boss) wild battle, waves 10-180
-      if (this.isWaveMysteryEncounter(newBattleType, newWaveIndex, mysteryEncounterType) || newBattleType === BattleType.MYSTERY_ENCOUNTER) {
+      if (this.isWaveMysteryEncounter(newBattleType, newWaveIndex) || newBattleType === BattleType.MYSTERY_ENCOUNTER) {
         newBattleType = BattleType.MYSTERY_ENCOUNTER;
-        // Reset base spawn weight
+        // Reset to base spawn weight
         this.mysteryEncounterSaveData.encounterSpawnChance = BASE_MYSTERY_ENCOUNTER_SPAWN_WEIGHT;
-      } else if (newBattleType === BattleType.WILD) {
-        this.mysteryEncounterSaveData.encounterSpawnChance += WEIGHT_INCREMENT_ON_SPAWN_MISS;
       }
     }
 
@@ -2364,6 +2362,19 @@ export default class BattleScene extends SceneBase {
     return false;
   }
 
+  /**
+   * Will search for a specific phase in {@linkcode phaseQueuePrepend} via filter, and remove the first result if a match is found.
+   * @param phaseFilter filter function
+   */
+  tryRemoveUnshiftedPhase(phaseFilter: (phase: Phase) => boolean): boolean {
+    const phaseIndex = this.phaseQueuePrepend.findIndex(phaseFilter);
+    if (phaseIndex > -1) {
+      this.phaseQueuePrepend.splice(phaseIndex, 1);
+      return true;
+    }
+    return false;
+  }
+
   /**
    * Tries to add the input phase to index before target phase in the phaseQueue, else simply calls unshiftPhase()
    * @param phase {@linkcode Phase} the phase to be added
@@ -3125,18 +3136,26 @@ export default class BattleScene extends SceneBase {
     }
   }
 
+  /**
+   * Returns if a wave COULD spawn a {@linkcode MysteryEncounter}.
+   * Even if returns `true`, does not guarantee that a wave will actually be a ME.
+   * That check is made in {@linkcode BattleScene.isWaveMysteryEncounter} instead.
+   */
+  isMysteryEncounterValidForWave(battleType: BattleType, waveIndex: number): boolean {
+    const [ lowestMysteryEncounterWave, highestMysteryEncounterWave ] = this.gameMode.getMysteryEncounterLegalWaves();
+    return this.gameMode.hasMysteryEncounters && battleType === BattleType.WILD && !this.gameMode.isBoss(waveIndex) && waveIndex < highestMysteryEncounterWave && waveIndex > lowestMysteryEncounterWave;
+  }
+
   /**
    * Determines whether a wave should randomly generate a {@linkcode MysteryEncounter}.
    * Currently, the only modes that MEs are allowed in are Classic and Challenge.
    * Additionally, MEs cannot spawn outside of waves 10-180 in those modes
-   *
    * @param newBattleType
    * @param waveIndex
-   * @param sessionDataEncounterType
    */
-  private isWaveMysteryEncounter(newBattleType: BattleType, waveIndex: number, sessionDataEncounterType?: MysteryEncounterType): boolean {
+  private isWaveMysteryEncounter(newBattleType: BattleType, waveIndex: number): boolean {
     const [ lowestMysteryEncounterWave, highestMysteryEncounterWave ] = this.gameMode.getMysteryEncounterLegalWaves();
-    if (this.gameMode.hasMysteryEncounters && newBattleType === BattleType.WILD && !this.gameMode.isBoss(waveIndex) && waveIndex < highestMysteryEncounterWave && waveIndex > lowestMysteryEncounterWave) {
+    if (this.isMysteryEncounterValidForWave(newBattleType, waveIndex)) {
       // Base spawn weight is BASE_MYSTERY_ENCOUNTER_SPAWN_WEIGHT/256, and increases by WEIGHT_INCREMENT_ON_SPAWN_MISS/256 for each missed attempt at spawning an encounter on a valid floor
       const sessionEncounterRate = this.mysteryEncounterSaveData.encounterSpawnChance;
       const encounteredEvents = this.mysteryEncounterSaveData.encounteredEvents;
diff --git a/src/data/mystery-encounters/mystery-encounter-pokemon-data.ts b/src/data/custom-pokemon-data.ts
similarity index 68%
rename from src/data/mystery-encounters/mystery-encounter-pokemon-data.ts
rename to src/data/custom-pokemon-data.ts
index fc6ce313d415..2e94123fc845 100644
--- a/src/data/mystery-encounters/mystery-encounter-pokemon-data.ts
+++ b/src/data/custom-pokemon-data.ts
@@ -1,18 +1,20 @@
 import { Abilities } from "#enums/abilities";
 import { Type } from "#app/data/type";
 import { isNullOrUndefined } from "#app/utils";
+import { Nature } from "#enums/nature";
 
 /**
  * Data that can customize a Pokemon in non-standard ways from its Species
- * Currently only used by Mystery Encounters, may need to be renamed if it becomes more widely used
+ * Currently only used by Mystery Encounters and Mints.
  */
-export class MysteryEncounterPokemonData {
+export class CustomPokemonData {
   public spriteScale: number;
   public ability: Abilities | -1;
   public passive: Abilities | -1;
+  public nature: Nature | -1;
   public types: Type[];
 
-  constructor(data?: MysteryEncounterPokemonData | Partial<MysteryEncounterPokemonData>) {
+  constructor(data?: CustomPokemonData | Partial<CustomPokemonData>) {
     if (!isNullOrUndefined(data)) {
       Object.assign(this, data);
     }
@@ -20,6 +22,7 @@ export class MysteryEncounterPokemonData {
     this.spriteScale = this.spriteScale ?? -1;
     this.ability = this.ability ?? -1;
     this.passive = this.passive ?? -1;
+    this.nature = this.nature ?? -1;
     this.types = this.types ?? [];
   }
 }
diff --git a/src/data/mystery-encounters/encounters/an-offer-you-cant-refuse-encounter.ts b/src/data/mystery-encounters/encounters/an-offer-you-cant-refuse-encounter.ts
index ab892ae00f23..8dc4eca25bf6 100644
--- a/src/data/mystery-encounters/encounters/an-offer-you-cant-refuse-encounter.ts
+++ b/src/data/mystery-encounters/encounters/an-offer-you-cant-refuse-encounter.ts
@@ -133,8 +133,8 @@ export const AnOfferYouCantRefuseEncounter: MysteryEncounter =
       MysteryEncounterOptionBuilder
         .newOptionWithMode(MysteryEncounterOptionMode.DISABLED_OR_SPECIAL)
         .withPrimaryPokemonRequirement(new CombinationPokemonRequirement(
-          new MoveRequirement(EXTORTION_MOVES),
-          new AbilityRequirement(EXTORTION_ABILITIES))
+          new MoveRequirement(EXTORTION_MOVES, true),
+          new AbilityRequirement(EXTORTION_ABILITIES, true))
         )
         .withDialogue({
           buttonLabel: `${namespace}:option.2.label`,
diff --git a/src/data/mystery-encounters/encounters/bug-type-superfan-encounter.ts b/src/data/mystery-encounters/encounters/bug-type-superfan-encounter.ts
index b5d47cf6912f..d316ab14cde4 100644
--- a/src/data/mystery-encounters/encounters/bug-type-superfan-encounter.ts
+++ b/src/data/mystery-encounters/encounters/bug-type-superfan-encounter.ts
@@ -42,6 +42,8 @@ import {
   AttackTypeBoosterModifier,
   BypassSpeedChanceModifier,
   ContactHeldItemTransferChanceModifier,
+  GigantamaxAccessModifier,
+  MegaEvolutionAccessModifier,
   PokemonHeldItemModifier
 } from "#app/modifier/modifier";
 import i18next from "i18next";
@@ -356,10 +358,17 @@ export const BugTypeSuperfanEncounter: MysteryEncounter =
             },
           ];
         } else {
-          // If player has any evolution/form change items that are valid for their party, will spawn one of those items in addition to a Master Ball
-          const modifierOptions: ModifierTypeOption[] = [ generateModifierTypeOption(scene, modifierTypes.MASTER_BALL)!, generateModifierTypeOption(scene, modifierTypes.MAX_LURE)! ];
+          // If the player has any evolution/form change items that are valid for their party,
+          // spawn one of those items in addition to Dynamax Band, Mega Band, and Master Ball
+          const modifierOptions: ModifierTypeOption[] = [ generateModifierTypeOption(scene, modifierTypes.MASTER_BALL)! ];
           const specialOptions: ModifierTypeOption[] = [];
 
+          if (!scene.findModifier(m => m instanceof MegaEvolutionAccessModifier)) {
+            modifierOptions.push(generateModifierTypeOption(scene, modifierTypes.MEGA_BRACELET)!);
+          }
+          if (!scene.findModifier(m => m instanceof GigantamaxAccessModifier)) {
+            modifierOptions.push(generateModifierTypeOption(scene, modifierTypes.DYNAMAX_BAND)!);
+          }
           const nonRareEvolutionModifier = generateModifierTypeOption(scene, modifierTypes.EVOLUTION_ITEM);
           if (nonRareEvolutionModifier) {
             specialOptions.push(nonRareEvolutionModifier);
diff --git a/src/data/mystery-encounters/encounters/clowning-around-encounter.ts b/src/data/mystery-encounters/encounters/clowning-around-encounter.ts
index be52ab42c9dd..57c8aa7a561e 100644
--- a/src/data/mystery-encounters/encounters/clowning-around-encounter.ts
+++ b/src/data/mystery-encounters/encounters/clowning-around-encounter.ts
@@ -28,7 +28,7 @@ import { BattlerIndex } from "#app/battle";
 import { Moves } from "#enums/moves";
 import { EncounterBattleAnim } from "#app/data/battle-anims";
 import { MoveCategory } from "#app/data/move";
-import { MysteryEncounterPokemonData } from "#app/data/mystery-encounters/mystery-encounter-pokemon-data";
+import { CustomPokemonData } from "#app/data/custom-pokemon-data";
 import { CLASSIC_MODE_MYSTERY_ENCOUNTER_WAVES } from "#app/game-mode";
 import { EncounterAnim } from "#enums/encounter-anims";
 import { Challenges } from "#enums/challenges";
@@ -133,7 +133,7 @@ export const ClowningAroundEncounter: MysteryEncounter =
           },
           { // Blacephalon has the random ability from pool, and 2 entirely random types to fit with the theme of the encounter
             species: getPokemonSpecies(Species.BLACEPHALON),
-            mysteryEncounterPokemonData: new MysteryEncounterPokemonData({ ability: ability, types: [ randSeedInt(18), randSeedInt(18) ]}),
+            customPokemonData: new CustomPokemonData({ ability: ability, types: [ randSeedInt(18), randSeedInt(18) ]}),
             isBoss: true,
             moveSet: [ Moves.TRICK, Moves.HYPNOSIS, Moves.SHADOW_BALL, Moves.MIND_BLOWN ]
           },
@@ -353,15 +353,15 @@ export const ClowningAroundEncounter: MysteryEncounter =
             newTypes.push(secondType);
 
             // Apply the type changes (to both base and fusion, if pokemon is fused)
-            if (!pokemon.mysteryEncounterPokemonData) {
-              pokemon.mysteryEncounterPokemonData = new MysteryEncounterPokemonData();
+            if (!pokemon.customPokemonData) {
+              pokemon.customPokemonData = new CustomPokemonData();
             }
-            pokemon.mysteryEncounterPokemonData.types = newTypes;
+            pokemon.customPokemonData.types = newTypes;
             if (pokemon.isFusion()) {
-              if (!pokemon.fusionMysteryEncounterPokemonData) {
-                pokemon.fusionMysteryEncounterPokemonData = new MysteryEncounterPokemonData();
+              if (!pokemon.fusionCustomPokemonData) {
+                pokemon.fusionCustomPokemonData = new CustomPokemonData();
               }
-              pokemon.fusionMysteryEncounterPokemonData.types = newTypes;
+              pokemon.fusionCustomPokemonData.types = newTypes;
             }
           }
         })
@@ -426,15 +426,15 @@ function onYesAbilitySwap(scene: BattleScene, resolve) {
     // Do ability swap
     const encounter = scene.currentBattle.mysteryEncounter!;
     if (pokemon.isFusion()) {
-      if (!pokemon.fusionMysteryEncounterPokemonData) {
-        pokemon.fusionMysteryEncounterPokemonData = new MysteryEncounterPokemonData();
+      if (!pokemon.fusionCustomPokemonData) {
+        pokemon.fusionCustomPokemonData = new CustomPokemonData();
       }
-      pokemon.fusionMysteryEncounterPokemonData.ability = encounter.misc.ability;
+      pokemon.fusionCustomPokemonData.ability = encounter.misc.ability;
     } else {
-      if (!pokemon.mysteryEncounterPokemonData) {
-        pokemon.mysteryEncounterPokemonData = new MysteryEncounterPokemonData();
+      if (!pokemon.customPokemonData) {
+        pokemon.customPokemonData = new CustomPokemonData();
       }
-      pokemon.mysteryEncounterPokemonData.ability = encounter.misc.ability;
+      pokemon.customPokemonData.ability = encounter.misc.ability;
     }
     encounter.setDialogueToken("chosenPokemon", pokemon.getNameToRender());
     scene.ui.setMode(Mode.MESSAGE).then(() => resolve(true));
diff --git a/src/data/mystery-encounters/encounters/dancing-lessons-encounter.ts b/src/data/mystery-encounters/encounters/dancing-lessons-encounter.ts
index d7f71194f480..55d7ce0e92d8 100644
--- a/src/data/mystery-encounters/encounters/dancing-lessons-encounter.ts
+++ b/src/data/mystery-encounters/encounters/dancing-lessons-encounter.ts
@@ -236,7 +236,7 @@ export const DancingLessonsEncounter: MysteryEncounter =
     .withOption(
       MysteryEncounterOptionBuilder
         .newOptionWithMode(MysteryEncounterOptionMode.DISABLED_OR_SPECIAL)
-        .withPrimaryPokemonRequirement(new MoveRequirement(DANCING_MOVES)) // Will set option3PrimaryName and option3PrimaryMove dialogue tokens automatically
+        .withPrimaryPokemonRequirement(new MoveRequirement(DANCING_MOVES, true)) // Will set option3PrimaryName and option3PrimaryMove dialogue tokens automatically
         .withDialogue({
           buttonLabel: `${namespace}:option.3.label`,
           buttonTooltip: `${namespace}:option.3.tooltip`,
diff --git a/src/data/mystery-encounters/encounters/fight-or-flight-encounter.ts b/src/data/mystery-encounters/encounters/fight-or-flight-encounter.ts
index 380662ca8170..889868519d29 100644
--- a/src/data/mystery-encounters/encounters/fight-or-flight-encounter.ts
+++ b/src/data/mystery-encounters/encounters/fight-or-flight-encounter.ts
@@ -145,7 +145,7 @@ export const FightOrFlightEncounter: MysteryEncounter =
     .withOption(
       MysteryEncounterOptionBuilder
         .newOptionWithMode(MysteryEncounterOptionMode.DISABLED_OR_SPECIAL)
-        .withPrimaryPokemonRequirement(new MoveRequirement(STEALING_MOVES)) // Will set option2PrimaryName and option2PrimaryMove dialogue tokens automatically
+        .withPrimaryPokemonRequirement(new MoveRequirement(STEALING_MOVES, true)) // Will set option2PrimaryName and option2PrimaryMove dialogue tokens automatically
         .withDialogue({
           buttonLabel: `${namespace}:option.2.label`,
           buttonTooltip: `${namespace}:option.2.tooltip`,
diff --git a/src/data/mystery-encounters/encounters/part-timer-encounter.ts b/src/data/mystery-encounters/encounters/part-timer-encounter.ts
index 17a3a366569e..092d2ab26739 100644
--- a/src/data/mystery-encounters/encounters/part-timer-encounter.ts
+++ b/src/data/mystery-encounters/encounters/part-timer-encounter.ts
@@ -227,7 +227,7 @@ export const PartTimerEncounter: MysteryEncounter =
     .withOption(
       MysteryEncounterOptionBuilder
         .newOptionWithMode(MysteryEncounterOptionMode.DISABLED_OR_SPECIAL)
-        .withPrimaryPokemonRequirement(new MoveRequirement(CHARMING_MOVES)) // Will set option3PrimaryName and option3PrimaryMove dialogue tokens automatically
+        .withPrimaryPokemonRequirement(new MoveRequirement(CHARMING_MOVES, true)) // Will set option3PrimaryName and option3PrimaryMove dialogue tokens automatically
         .withDialogue({
           buttonLabel: `${namespace}:option.3.label`,
           buttonTooltip: `${namespace}:option.3.tooltip`,
diff --git a/src/data/mystery-encounters/encounters/shady-vitamin-dealer-encounter.ts b/src/data/mystery-encounters/encounters/shady-vitamin-dealer-encounter.ts
index 5b609a2b1c3c..d30c97b27de5 100644
--- a/src/data/mystery-encounters/encounters/shady-vitamin-dealer-encounter.ts
+++ b/src/data/mystery-encounters/encounters/shady-vitamin-dealer-encounter.ts
@@ -138,7 +138,7 @@ export const ShadyVitaminDealerEncounter: MysteryEncounter =
             newNature = randSeedInt(25) as Nature;
           }
 
-          chosenPokemon.nature = newNature;
+          chosenPokemon.customPokemonData.nature = newNature;
           encounter.setDialogueToken("newNature", getNatureName(newNature));
           queueEncounterMessage(scene, `${namespace}:cheap_side_effects`);
           setEncounterExp(scene, [ chosenPokemon.id ], 100);
diff --git a/src/data/mystery-encounters/encounters/slumbering-snorlax-encounter.ts b/src/data/mystery-encounters/encounters/slumbering-snorlax-encounter.ts
index 3a4bf465a78e..8ea19e1225ba 100644
--- a/src/data/mystery-encounters/encounters/slumbering-snorlax-encounter.ts
+++ b/src/data/mystery-encounters/encounters/slumbering-snorlax-encounter.ts
@@ -18,7 +18,7 @@ import { MysteryEncounterOptionMode } from "#enums/mystery-encounter-option-mode
 import { PartyHealPhase } from "#app/phases/party-heal-phase";
 import { CLASSIC_MODE_MYSTERY_ENCOUNTER_WAVES } from "#app/game-mode";
 import { BerryType } from "#enums/berry-type";
-import { MysteryEncounterPokemonData } from "#app/data/mystery-encounters/mystery-encounter-pokemon-data";
+import { CustomPokemonData } from "#app/data/custom-pokemon-data";
 
 /** i18n namespace for the encounter */
 const namespace = "mysteryEncounters/slumberingSnorlax";
@@ -72,7 +72,7 @@ export const SlumberingSnorlaxEncounter: MysteryEncounter =
             stackCount: 2
           },
         ],
-        mysteryEncounterPokemonData: new MysteryEncounterPokemonData({ spriteScale: 1.25 }),
+        customPokemonData: new CustomPokemonData({ spriteScale: 1.25 }),
         aiType: AiType.SMART // Required to ensure Snorlax uses Sleep Talk while it is asleep
       };
       const config: EnemyPartyConfig = {
@@ -143,7 +143,7 @@ export const SlumberingSnorlaxEncounter: MysteryEncounter =
     .withOption(
       MysteryEncounterOptionBuilder
         .newOptionWithMode(MysteryEncounterOptionMode.DISABLED_OR_SPECIAL)
-        .withPrimaryPokemonRequirement(new MoveRequirement(STEALING_MOVES))
+        .withPrimaryPokemonRequirement(new MoveRequirement(STEALING_MOVES, true))
         .withDialogue({
           buttonLabel: `${namespace}:option.3.label`,
           buttonTooltip: `${namespace}:option.3.tooltip`,
diff --git a/src/data/mystery-encounters/encounters/the-expert-pokemon-breeder-encounter.ts b/src/data/mystery-encounters/encounters/the-expert-pokemon-breeder-encounter.ts
index 945e7ee188d2..9c10d33d0192 100644
--- a/src/data/mystery-encounters/encounters/the-expert-pokemon-breeder-encounter.ts
+++ b/src/data/mystery-encounters/encounters/the-expert-pokemon-breeder-encounter.ts
@@ -25,6 +25,7 @@ import { achvs } from "#app/system/achv";
 import { modifierTypes, PokemonHeldItemModifierType } from "#app/modifier/modifier-type";
 import { Type } from "#app/data/type";
 import { getPokeballTintColor } from "#app/data/pokeball";
+import { PokemonHeldItemModifier } from "#app/modifier/modifier";
 
 /** the i18n namespace for the encounter */
 const namespace = "mysteryEncounters/theExpertPokemonBreeder";
@@ -163,7 +164,7 @@ export const TheExpertPokemonBreederEncounter: MysteryEncounter =
       if (pokemon2CommonEggs > 0) {
         const eggsText = i18next.t(`${namespace}:numEggs`, { count: pokemon2CommonEggs, rarity: i18next.t("egg:defaultTier") });
         pokemon2Tooltip += i18next.t(`${namespace}:eggs_tooltip`, { eggs: eggsText });
-        encounter.setDialogueToken("pokemon1CommonEggs", eggsText);
+        encounter.setDialogueToken("pokemon2CommonEggs", eggsText);
       }
       encounter.options[1].dialogue!.buttonTooltip = pokemon2Tooltip;
 
@@ -221,7 +222,7 @@ export const TheExpertPokemonBreederEncounter: MysteryEncounter =
           encounter.misc.chosenPokemon = pokemon1;
           encounter.setDialogueToken("chosenPokemon", pokemon1.getNameToRender());
           const eggOptions = getEggOptions(scene, pokemon1CommonEggs, pokemon1RareEggs);
-          setEncounterRewards(scene, { fillRemaining: true }, eggOptions);
+          setEncounterRewards(scene, { fillRemaining: true }, eggOptions, () => doPostEncounterCleanup(scene));
 
           // Remove all Pokemon from the party except the chosen Pokemon
           removePokemonFromPartyAndStoreHeldItems(scene, encounter, pokemon1);
@@ -247,9 +248,6 @@ export const TheExpertPokemonBreederEncounter: MysteryEncounter =
           encounter.onGameOver = onGameOver;
           await initBattleWithEnemyConfig(scene, config);
         })
-        .withPostOptionPhase(async (scene: BattleScene) => {
-          await doPostEncounterCleanup(scene);
-        })
         .build()
     )
     .withOption(
@@ -273,7 +271,7 @@ export const TheExpertPokemonBreederEncounter: MysteryEncounter =
           encounter.misc.chosenPokemon = pokemon2;
           encounter.setDialogueToken("chosenPokemon", pokemon2.getNameToRender());
           const eggOptions = getEggOptions(scene, pokemon2CommonEggs, pokemon2RareEggs);
-          setEncounterRewards(scene, { fillRemaining: true }, eggOptions);
+          setEncounterRewards(scene, { fillRemaining: true }, eggOptions, () => doPostEncounterCleanup(scene));
 
           // Remove all Pokemon from the party except the chosen Pokemon
           removePokemonFromPartyAndStoreHeldItems(scene, encounter, pokemon2);
@@ -299,9 +297,6 @@ export const TheExpertPokemonBreederEncounter: MysteryEncounter =
           encounter.onGameOver = onGameOver;
           await initBattleWithEnemyConfig(scene, config);
         })
-        .withPostOptionPhase(async (scene: BattleScene) => {
-          await doPostEncounterCleanup(scene);
-        })
         .build()
     )
     .withOption(
@@ -325,7 +320,7 @@ export const TheExpertPokemonBreederEncounter: MysteryEncounter =
           encounter.misc.chosenPokemon = pokemon3;
           encounter.setDialogueToken("chosenPokemon", pokemon3.getNameToRender());
           const eggOptions = getEggOptions(scene, pokemon3CommonEggs, pokemon3RareEggs);
-          setEncounterRewards(scene, { fillRemaining: true }, eggOptions);
+          setEncounterRewards(scene, { fillRemaining: true }, eggOptions, () => doPostEncounterCleanup(scene));
 
           // Remove all Pokemon from the party except the chosen Pokemon
           removePokemonFromPartyAndStoreHeldItems(scene, encounter, pokemon3);
@@ -351,9 +346,6 @@ export const TheExpertPokemonBreederEncounter: MysteryEncounter =
           encounter.onGameOver = onGameOver;
           await initBattleWithEnemyConfig(scene, config);
         })
-        .withPostOptionPhase(async (scene: BattleScene) => {
-          await doPostEncounterCleanup(scene);
-        })
         .build()
     )
     .withOutroDialogue([
@@ -521,19 +513,19 @@ function checkAchievement(scene: BattleScene) {
   }
 }
 
-async function restorePartyAndHeldItems(scene: BattleScene) {
+function restorePartyAndHeldItems(scene: BattleScene) {
   const encounter = scene.currentBattle.mysteryEncounter!;
   // Restore original party
   scene.getParty().push(...encounter.misc.originalParty);
 
   // Restore held items
   const originalHeldItems = encounter.misc.originalPartyHeldItems;
-  originalHeldItems.forEach(pokemonHeldItemsList => {
+  originalHeldItems.forEach((pokemonHeldItemsList: PokemonHeldItemModifier[]) => {
     pokemonHeldItemsList.forEach(heldItem => {
       scene.addModifier(heldItem, true, false, false, true);
     });
   });
-  await scene.updateModifiers(true);
+  scene.updateModifiers(true);
 }
 
 function onGameOver(scene: BattleScene) {
@@ -609,13 +601,13 @@ function onGameOver(scene: BattleScene) {
   return false;
 }
 
-async function doPostEncounterCleanup(scene: BattleScene) {
+function doPostEncounterCleanup(scene: BattleScene) {
   const encounter = scene.currentBattle.mysteryEncounter!;
   if (!encounter.misc.encounterFailed) {
     // Give achievement if in Space biome
     checkAchievement(scene);
     // Give 20 friendship to the chosen pokemon
     encounter.misc.chosenPokemon.addFriendship(FRIENDSHIP_ADDED);
-    await restorePartyAndHeldItems(scene);
+    restorePartyAndHeldItems(scene);
   }
 }
diff --git a/src/data/mystery-encounters/encounters/the-strong-stuff-encounter.ts b/src/data/mystery-encounters/encounters/the-strong-stuff-encounter.ts
index 03cf86d06a58..397d2af9522d 100644
--- a/src/data/mystery-encounters/encounters/the-strong-stuff-encounter.ts
+++ b/src/data/mystery-encounters/encounters/the-strong-stuff-encounter.ts
@@ -14,7 +14,7 @@ import { BattlerIndex } from "#app/battle";
 import { BattlerTagType } from "#enums/battler-tag-type";
 import { BerryType } from "#enums/berry-type";
 import { MysteryEncounterTier } from "#enums/mystery-encounter-tier";
-import { MysteryEncounterPokemonData } from "#app/data/mystery-encounters/mystery-encounter-pokemon-data";
+import { CustomPokemonData } from "#app/data/custom-pokemon-data";
 import { Stat } from "#enums/stat";
 import { StatStageChangePhase } from "#app/phases/stat-stage-change-phase";
 import { CLASSIC_MODE_MYSTERY_ENCOUNTER_WAVES } from "#app/game-mode";
@@ -79,7 +79,7 @@ export const TheStrongStuffEncounter: MysteryEncounter =
             species: getPokemonSpecies(Species.SHUCKLE),
             isBoss: true,
             bossSegments: 5,
-            mysteryEncounterPokemonData: new MysteryEncounterPokemonData({ spriteScale: 1.25 }),
+            customPokemonData: new CustomPokemonData({ spriteScale: 1.25 }),
             nature: Nature.BOLD,
             moveSet: [ Moves.INFESTATION, Moves.SALT_CURE, Moves.GASTRO_ACID, Moves.HEAL_ORDER ],
             modifierConfigs: [
diff --git a/src/data/mystery-encounters/encounters/uncommon-breed-encounter.ts b/src/data/mystery-encounters/encounters/uncommon-breed-encounter.ts
index 13594f273d9b..b7ce3bab48c0 100644
--- a/src/data/mystery-encounters/encounters/uncommon-breed-encounter.ts
+++ b/src/data/mystery-encounters/encounters/uncommon-breed-encounter.ts
@@ -210,7 +210,7 @@ export const UncommonBreedEncounter: MysteryEncounter =
     .withOption(
       MysteryEncounterOptionBuilder
         .newOptionWithMode(MysteryEncounterOptionMode.DISABLED_OR_SPECIAL)
-        .withPrimaryPokemonRequirement(new MoveRequirement(CHARMING_MOVES)) // Will set option2PrimaryName and option2PrimaryMove dialogue tokens automatically
+        .withPrimaryPokemonRequirement(new MoveRequirement(CHARMING_MOVES, true)) // Will set option2PrimaryName and option2PrimaryMove dialogue tokens automatically
         .withDialogue({
           buttonLabel: `${namespace}:option.3.label`,
           buttonTooltip: `${namespace}:option.3.tooltip`,
diff --git a/src/data/mystery-encounters/encounters/weird-dream-encounter.ts b/src/data/mystery-encounters/encounters/weird-dream-encounter.ts
index 6e2f8352480c..b97a22dbe515 100644
--- a/src/data/mystery-encounters/encounters/weird-dream-encounter.ts
+++ b/src/data/mystery-encounters/encounters/weird-dream-encounter.ts
@@ -12,7 +12,7 @@ import { IntegerHolder, isNullOrUndefined, randSeedInt, randSeedShuffle } from "
 import PokemonSpecies, { allSpecies, getPokemonSpecies } from "#app/data/pokemon-species";
 import { HiddenAbilityRateBoosterModifier, PokemonFormChangeItemModifier, PokemonHeldItemModifier } from "#app/modifier/modifier";
 import { achvs } from "#app/system/achv";
-import { MysteryEncounterPokemonData } from "#app/data/mystery-encounters/mystery-encounter-pokemon-data";
+import { CustomPokemonData } from "#app/data/custom-pokemon-data";
 import { showEncounterText } from "#app/data/mystery-encounters/utils/encounter-dialogue-utils";
 import { modifierTypes } from "#app/modifier/modifier-type";
 import i18next from "#app/plugins/i18n";
@@ -379,10 +379,10 @@ async function doNewTeamPostProcess(scene: BattleScene, transformations: Pokemon
       newType = randSeedInt(18) as Type;
     }
     newTypes.push(newType);
-    if (!newPokemon.mysteryEncounterPokemonData) {
-      newPokemon.mysteryEncounterPokemonData = new MysteryEncounterPokemonData();
+    if (!newPokemon.customPokemonData) {
+      newPokemon.customPokemonData = new CustomPokemonData();
     }
-    newPokemon.mysteryEncounterPokemonData.types = newTypes;
+    newPokemon.customPokemonData.types = newTypes;
 
     for (const item of transformation.heldItems) {
       item.pokemonId = newPokemon.id;
diff --git a/src/data/mystery-encounters/mystery-encounter-requirements.ts b/src/data/mystery-encounters/mystery-encounter-requirements.ts
index 86e04e808073..a57cedc8fa35 100644
--- a/src/data/mystery-encounters/mystery-encounter-requirements.ts
+++ b/src/data/mystery-encounters/mystery-encounter-requirements.ts
@@ -15,6 +15,7 @@ import { MysteryEncounterType } from "#enums/mystery-encounter-type";
 import { AttackTypeBoosterModifier } from "#app/modifier/modifier";
 import { AttackTypeBoosterModifierType } from "#app/modifier/modifier-type";
 import { SpeciesFormKey } from "#enums/species-form-key";
+import { allAbilities } from "#app/data/ability";
 
 export interface EncounterRequirement {
   meetsRequirement(scene: BattleScene): boolean; // Boolean to see if a requirement is met
@@ -476,9 +477,11 @@ export class MoveRequirement extends EncounterPokemonRequirement {
   requiredMoves: Moves[] = [];
   minNumberOfPokemon: number;
   invertQuery: boolean;
+  excludeDisallowedPokemon: boolean;
 
-  constructor(moves: Moves | Moves[], minNumberOfPokemon: number = 1, invertQuery: boolean = false) {
+  constructor(moves: Moves | Moves[], excludeDisallowedPokemon: boolean, minNumberOfPokemon: number = 1, invertQuery: boolean = false) {
     super();
+    this.excludeDisallowedPokemon = excludeDisallowedPokemon;
     this.minNumberOfPokemon = minNumberOfPokemon;
     this.invertQuery = invertQuery;
     this.requiredMoves = Array.isArray(moves) ? moves : [ moves ];
@@ -494,10 +497,15 @@ export class MoveRequirement extends EncounterPokemonRequirement {
 
   override queryParty(partyPokemon: PlayerPokemon[]): PlayerPokemon[] {
     if (!this.invertQuery) {
-      return partyPokemon.filter((pokemon) => this.requiredMoves.filter((reqMove) => pokemon.moveset.filter((move) => move?.moveId === reqMove).length > 0).length > 0);
+      // get the Pokemon with at least one move in the required moves list
+      return partyPokemon.filter((pokemon) =>
+        (!this.excludeDisallowedPokemon || pokemon.isAllowedInBattle())
+        && pokemon.moveset.some((move) => move?.moveId && this.requiredMoves.includes(move.moveId)));
     } else {
       // for an inverted query, we only want to get the pokemon that don't have ANY of the listed moves
-      return partyPokemon.filter((pokemon) => this.requiredMoves.filter((reqMove) => pokemon.moveset.filter((move) => move?.moveId === reqMove).length === 0).length === 0);
+      return partyPokemon.filter((pokemon) =>
+        (!this.excludeDisallowedPokemon || pokemon.isAllowedInBattle())
+        && !pokemon.moveset.some((move) => move?.moveId && this.requiredMoves.includes(move.moveId)));
     }
   }
 
@@ -559,9 +567,11 @@ export class AbilityRequirement extends EncounterPokemonRequirement {
   requiredAbilities: Abilities[];
   minNumberOfPokemon: number;
   invertQuery: boolean;
+  excludeDisallowedPokemon: boolean;
 
-  constructor(abilities: Abilities | Abilities[], minNumberOfPokemon: number = 1, invertQuery: boolean = false) {
+  constructor(abilities: Abilities | Abilities[], excludeDisallowedPokemon: boolean, minNumberOfPokemon: number = 1, invertQuery: boolean = false) {
     super();
+    this.excludeDisallowedPokemon = excludeDisallowedPokemon;
     this.minNumberOfPokemon = minNumberOfPokemon;
     this.invertQuery = invertQuery;
     this.requiredAbilities = Array.isArray(abilities) ? abilities : [ abilities ];
@@ -577,16 +587,21 @@ export class AbilityRequirement extends EncounterPokemonRequirement {
 
   override queryParty(partyPokemon: PlayerPokemon[]): PlayerPokemon[] {
     if (!this.invertQuery) {
-      return partyPokemon.filter((pokemon) => this.requiredAbilities.some((ability) => pokemon.getAbility().id === ability));
+      return partyPokemon.filter((pokemon) =>
+        (!this.excludeDisallowedPokemon || pokemon.isAllowedInBattle())
+        && this.requiredAbilities.some((ability) => pokemon.hasAbility(ability, false)));
     } else {
-      // for an inverted query, we only want to get the pokemon that don't have ANY of the listed abilitiess
-      return partyPokemon.filter((pokemon) => this.requiredAbilities.filter((ability) => pokemon.getAbility().id === ability).length === 0);
+      // for an inverted query, we only want to get the pokemon that don't have ANY of the listed abilities
+      return partyPokemon.filter((pokemon) =>
+        (!this.excludeDisallowedPokemon || pokemon.isAllowedInBattle())
+        && this.requiredAbilities.filter((ability) => pokemon.hasAbility(ability, false)).length === 0);
     }
   }
 
-  override getDialogueToken(scene: BattleScene, pokemon?: PlayerPokemon): [string, string] {
-    if (pokemon?.getAbility().id && this.requiredAbilities.some(a => pokemon.getAbility().id === a)) {
-      return [ "ability", pokemon.getAbility().name ];
+  override getDialogueToken(_scene: BattleScene, pokemon?: PlayerPokemon): [string, string] {
+    const matchingAbility = this.requiredAbilities.find(a => pokemon?.hasAbility(a, false));
+    if (!isNullOrUndefined(matchingAbility)) {
+      return [ "ability", allAbilities[matchingAbility].name ];
     }
     return [ "ability", "" ];
   }
diff --git a/src/data/mystery-encounters/mystery-encounter.ts b/src/data/mystery-encounters/mystery-encounter.ts
index 7e175957e218..ee9eb159e10b 100644
--- a/src/data/mystery-encounters/mystery-encounter.ts
+++ b/src/data/mystery-encounters/mystery-encounter.ts
@@ -325,7 +325,7 @@ export default class MysteryEncounter implements IMysteryEncounter {
       if (activeMon.length > 0) {
         this.primaryPokemon = activeMon[0];
       } else {
-        this.primaryPokemon = scene.getParty().filter(p => !p.isFainted())[0];
+        this.primaryPokemon = scene.getParty().filter(p => p.isAllowedInBattle())[0];
       }
       return true;
     }
diff --git a/src/data/mystery-encounters/utils/encounter-phase-utils.ts b/src/data/mystery-encounters/utils/encounter-phase-utils.ts
index 485b955f9982..5cd2fbffd5f9 100644
--- a/src/data/mystery-encounters/utils/encounter-phase-utils.ts
+++ b/src/data/mystery-encounters/utils/encounter-phase-utils.ts
@@ -27,7 +27,7 @@ import { Status, StatusEffect } from "#app/data/status-effect";
 import { TrainerConfig, trainerConfigs, TrainerSlot } from "#app/data/trainer-config";
 import PokemonSpecies from "#app/data/pokemon-species";
 import { Egg, IEggOptions } from "#app/data/egg";
-import { MysteryEncounterPokemonData } from "#app/data/mystery-encounters/mystery-encounter-pokemon-data";
+import { CustomPokemonData } from "#app/data/custom-pokemon-data";
 import HeldModifierConfig from "#app/interfaces/held-modifier-config";
 import { MovePhase } from "#app/phases/move-phase";
 import { EggLapsePhase } from "#app/phases/egg-lapse-phase";
@@ -71,7 +71,7 @@ export interface EnemyPokemonConfig {
   nickname?: string;
   bossSegments?: number;
   bossSegmentModifier?: number; // Additive to the determined segment number
-  mysteryEncounterPokemonData?: MysteryEncounterPokemonData;
+  customPokemonData?: CustomPokemonData;
   formIndex?: number;
   abilityIndex?: number;
   level?: number;
@@ -145,7 +145,7 @@ export async function initBattleWithEnemyConfig(scene: BattleScene, partyConfig:
     newTrainer.setVisible(false);
     scene.field.add(newTrainer);
     scene.currentBattle.trainer = newTrainer;
-    loadEnemyAssets.push(newTrainer.loadAssets());
+    loadEnemyAssets.push(newTrainer.loadAssets().then(() => newTrainer.initSprite()));
 
     battle.enemyLevels = scene.currentBattle.trainer.getPartyLevels(scene.currentBattle.waveIndex);
   } else {
@@ -250,8 +250,8 @@ export async function initBattleWithEnemyConfig(scene: BattleScene, partyConfig:
       }
 
       // Set custom mystery encounter data fields (such as sprite scale, custom abilities, types, etc.)
-      if (!isNullOrUndefined(config.mysteryEncounterPokemonData)) {
-        enemyPokemon.mysteryEncounterPokemonData = config.mysteryEncounterPokemonData;
+      if (!isNullOrUndefined(config.customPokemonData)) {
+        enemyPokemon.customPokemonData = config.customPokemonData;
       }
 
       // Set Boss
diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index 0afbbf105e2c..7f2b4ec015df 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -62,7 +62,7 @@ import { ToggleDoublePositionPhase } from "#app/phases/toggle-double-position-ph
 import { Challenges } from "#enums/challenges";
 import { PokemonAnimType } from "#enums/pokemon-anim-type";
 import { PLAYER_PARTY_MAX_SIZE } from "#app/constants";
-import { MysteryEncounterPokemonData } from "#app/data/mystery-encounters/mystery-encounter-pokemon-data";
+import { CustomPokemonData } from "#app/data/custom-pokemon-data";
 import { SwitchType } from "#enums/switch-type";
 import { SpeciesFormKey } from "#enums/species-form-key";
 import { BASE_HIDDEN_ABILITY_CHANCE, BASE_SHINY_CHANCE, SHINY_EPIC_CHANCE, SHINY_VARIANT_CHANCE } from "#app/data/balance/rates";
@@ -114,7 +114,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
   public fusionVariant: Variant;
   public fusionGender: Gender;
   public fusionLuck: integer;
-  public fusionMysteryEncounterPokemonData: MysteryEncounterPokemonData | null;
+  public fusionCustomPokemonData: CustomPokemonData | null;
 
   private summonDataPrimer: PokemonSummonData | null;
 
@@ -122,7 +122,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
   public battleData: PokemonBattleData;
   public battleSummonData: PokemonBattleSummonData;
   public turnData: PokemonTurnData;
-  public mysteryEncounterPokemonData: MysteryEncounterPokemonData;
+  public customPokemonData: CustomPokemonData;
 
   /** Used by Mystery Encounters to execute pokemon-specific logic (such as stat boosts) at start of battle */
   public mysteryEncounterBattleEffects?: (pokemon: Pokemon) => void;
@@ -193,7 +193,6 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       }
       this.nature = dataSource.nature || 0 as Nature;
       this.nickname = dataSource.nickname;
-      this.natureOverride = dataSource.natureOverride !== undefined ? dataSource.natureOverride : -1;
       this.moveset = dataSource.moveset;
       this.status = dataSource.status!; // TODO: is this bang correct?
       this.friendship = dataSource.friendship !== undefined ? dataSource.friendship : this.species.baseFriendship;
@@ -212,9 +211,9 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       this.fusionVariant = dataSource.fusionVariant || 0;
       this.fusionGender = dataSource.fusionGender;
       this.fusionLuck = dataSource.fusionLuck;
-      this.fusionMysteryEncounterPokemonData = dataSource.fusionMysteryEncounterPokemonData;
+      this.fusionCustomPokemonData = dataSource.fusionCustomPokemonData;
       this.usedTMs = dataSource.usedTMs ?? [];
-      this.mysteryEncounterPokemonData = new MysteryEncounterPokemonData(dataSource.mysteryEncounterPokemonData);
+      this.customPokemonData = new CustomPokemonData(dataSource.customPokemonData);
     } else {
       this.id = Utils.randSeedInt(4294967296);
       this.ivs = ivs || Utils.getIvsFromId(this.id);
@@ -235,7 +234,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
         this.variant = this.shiny ? this.generateVariant() : 0;
       }
 
-      this.mysteryEncounterPokemonData = new MysteryEncounterPokemonData();
+      this.customPokemonData = new CustomPokemonData();
 
       if (nature !== undefined) {
         this.setNature(nature);
@@ -243,8 +242,6 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
         this.generateNature();
       }
 
-      this.natureOverride = -1;
-
       this.friendship = species.baseFriendship;
       this.metLevel = level;
       this.metBiome = scene.currentBattle ? scene.arena.biomeType : -1;
@@ -593,8 +590,8 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     const formKey = this.getFormKey();
     if (this.isMax() === true || formKey === "segin-starmobile" || formKey === "schedar-starmobile" || formKey === "navi-starmobile" || formKey === "ruchbah-starmobile" || formKey === "caph-starmobile") {
       return 1.5;
-    } else if (this.mysteryEncounterPokemonData.spriteScale > 0) {
-      return this.mysteryEncounterPokemonData.spriteScale;
+    } else if (this.customPokemonData.spriteScale > 0) {
+      return this.customPokemonData.spriteScale;
     }
     return 1;
   }
@@ -1023,7 +1020,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
   }
 
   getNature(): Nature {
-    return this.natureOverride !== -1 ? this.natureOverride : this.nature;
+    return this.customPokemonData.nature !== -1 ? this.customPokemonData.nature : this.nature;
   }
 
   setNature(nature: Nature): void {
@@ -1198,15 +1195,15 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     if (!types.length || !includeTeraType) {
       if (!ignoreOverride && this.summonData?.types && this.summonData.types.length > 0) {
         this.summonData.types.forEach(t => types.push(t));
-      } else if (this.mysteryEncounterPokemonData.types && this.mysteryEncounterPokemonData.types.length > 0) {
+      } else if (this.customPokemonData.types && this.customPokemonData.types.length > 0) {
         // "Permanent" override for a Pokemon's normal types, currently only used by Mystery Encounters
-        types.push(this.mysteryEncounterPokemonData.types[0]);
+        types.push(this.customPokemonData.types[0]);
 
         // Fusing a Pokemon onto something with "permanently changed" types will still apply the fusion's types as normal
         const fusionSpeciesForm = this.getFusionSpeciesForm(ignoreOverride);
         if (fusionSpeciesForm) {
           // Check if the fusion Pokemon also had "permanently changed" types
-          const fusionMETypes = this.fusionMysteryEncounterPokemonData?.types;
+          const fusionMETypes = this.fusionCustomPokemonData?.types;
           if (fusionMETypes && fusionMETypes.length >= 2 && fusionMETypes[1] !== types[0]) {
             types.push(fusionMETypes[1]);
           } else if (fusionMETypes && fusionMETypes.length === 1 && fusionMETypes[0] !== types[0]) {
@@ -1218,8 +1215,8 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
           }
         }
 
-        if (types.length === 1 && this.mysteryEncounterPokemonData.types.length >= 2) {
-          types.push(this.mysteryEncounterPokemonData.types[1]);
+        if (types.length === 1 && this.customPokemonData.types.length >= 2) {
+          types.push(this.customPokemonData.types[1]);
         }
       } else {
         const speciesForm = this.getSpeciesForm(ignoreOverride);
@@ -1230,7 +1227,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
         if (fusionSpeciesForm) {
           // Check if the fusion Pokemon also had "permanently changed" types
           // Otherwise, use standard fusion type logic
-          const fusionMETypes = this.fusionMysteryEncounterPokemonData?.types;
+          const fusionMETypes = this.fusionCustomPokemonData?.types;
           if (fusionMETypes && fusionMETypes.length >= 2 && fusionMETypes[1] !== types[0]) {
             types.push(fusionMETypes[1]);
           } else if (fusionMETypes && fusionMETypes.length === 1 && fusionMETypes[0] !== types[0]) {
@@ -1262,6 +1259,11 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       }
     }
 
+    // If both types are the same (can happen in weird custom typing scenarios), reduce to single type
+    if (types.length > 1 && types[0] === types[1]) {
+      types.splice(0, 1);
+    }
+
     return types;
   }
 
@@ -1288,14 +1290,14 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       return allAbilities[Overrides.OPP_ABILITY_OVERRIDE];
     }
     if (this.isFusion()) {
-      if (!isNullOrUndefined(this.fusionMysteryEncounterPokemonData?.ability) && this.fusionMysteryEncounterPokemonData.ability !== -1) {
-        return allAbilities[this.fusionMysteryEncounterPokemonData.ability];
+      if (!isNullOrUndefined(this.fusionCustomPokemonData?.ability) && this.fusionCustomPokemonData.ability !== -1) {
+        return allAbilities[this.fusionCustomPokemonData.ability];
       } else {
         return allAbilities[this.getFusionSpeciesForm(ignoreOverride).getAbility(this.fusionAbilityIndex)];
       }
     }
-    if (!isNullOrUndefined(this.mysteryEncounterPokemonData.ability) && this.mysteryEncounterPokemonData.ability !== -1) {
-      return allAbilities[this.mysteryEncounterPokemonData.ability];
+    if (!isNullOrUndefined(this.customPokemonData.ability) && this.customPokemonData.ability !== -1) {
+      return allAbilities[this.customPokemonData.ability];
     }
     let abilityId = this.getSpeciesForm(ignoreOverride).getAbility(this.abilityIndex);
     if (abilityId === Abilities.NONE) {
@@ -1318,8 +1320,8 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     if (Overrides.OPP_PASSIVE_ABILITY_OVERRIDE && !this.isPlayer()) {
       return allAbilities[Overrides.OPP_PASSIVE_ABILITY_OVERRIDE];
     }
-    if (!isNullOrUndefined(this.mysteryEncounterPokemonData.passive) && this.mysteryEncounterPokemonData.passive !== -1) {
-      return allAbilities[this.mysteryEncounterPokemonData.passive];
+    if (!isNullOrUndefined(this.customPokemonData.passive) && this.customPokemonData.passive !== -1) {
+      return allAbilities[this.customPokemonData.passive];
     }
 
     let starterSpeciesId = this.species.speciesId;
@@ -2018,7 +2020,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     this.fusionVariant = 0;
     this.fusionGender = 0;
     this.fusionLuck = 0;
-    this.fusionMysteryEncounterPokemonData = null;
+    this.fusionCustomPokemonData = null;
 
     this.generateName();
     this.calculateStats();
@@ -2187,7 +2189,10 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       this.moveset.push(new PokemonMove(movePool[index][0], 0, 0));
     }
 
-    this.scene.triggerPokemonFormChange(this, SpeciesFormChangeMoveLearnedTrigger);
+    // Trigger FormChange, except for enemy Pokemon during Mystery Encounters, to avoid crashes
+    if (this.isPlayer() || !this.scene.currentBattle?.isBattleMysteryEncounter() || !this.scene.currentBattle?.mysteryEncounter) {
+      this.scene.triggerPokemonFormChange(this, SpeciesFormChangeMoveLearnedTrigger);
+    }
   }
 
   trySelectMove(moveIndex: integer, ignorePp?: boolean): boolean {
@@ -4292,12 +4297,33 @@ export class PlayerPokemon extends Pokemon {
 
   changeForm(formChange: SpeciesFormChange): Promise<void> {
     return new Promise(resolve => {
+      const previousFormIndex = this.formIndex;
       this.formIndex = Math.max(this.species.forms.findIndex(f => f.formKey === formChange.formKey), 0);
       this.generateName();
       const abilityCount = this.getSpeciesForm().getAbilityCount();
       if (this.abilityIndex >= abilityCount) { // Shouldn't happen
         this.abilityIndex = abilityCount - 1;
       }
+
+      // In cases where a form change updates the type of a Pokemon from its previous form (Arceus, Silvally, Castform, etc.),
+      // persist that type change in customPokemonData if necessary
+      const baseForm = this.species.forms[previousFormIndex];
+      const baseFormTypes = [ baseForm.type1, baseForm.type2 ];
+      if (this.customPokemonData.types.length > 0) {
+        if (this.getSpeciesForm().type1 !== baseFormTypes[0]) {
+          this.customPokemonData.types[0] = this.getSpeciesForm().type1;
+        }
+
+        const type2 = this.getSpeciesForm().type2;
+        if (!isNullOrUndefined(type2) && type2 !== baseFormTypes[1]) {
+          if (this.customPokemonData.types.length > 1) {
+            this.customPokemonData.types[1] = type2;
+          } else {
+            this.customPokemonData.types.push(type2);
+          }
+        }
+      }
+
       this.compatibleTms.splice(0, this.compatibleTms.length);
       this.generateCompatibleTms();
       const updateAndResolve = () => {
@@ -4334,7 +4360,7 @@ export class PlayerPokemon extends Pokemon {
       this.fusionVariant = pokemon.variant;
       this.fusionGender = pokemon.gender;
       this.fusionLuck = pokemon.luck;
-      this.fusionMysteryEncounterPokemonData = pokemon.mysteryEncounterPokemonData;
+      this.fusionCustomPokemonData = pokemon.customPokemonData;
       if ((pokemon.pauseEvolutions) || (this.pauseEvolutions)) {
         this.pauseEvolutions = true;
       }
diff --git a/src/modifier/modifier-type.ts b/src/modifier/modifier-type.ts
index 674c5f47c88f..8e7853a41bb8 100644
--- a/src/modifier/modifier-type.ts
+++ b/src/modifier/modifier-type.ts
@@ -1126,7 +1126,7 @@ class EvolutionItemModifierTypeGenerator extends ModifierTypeGenerator {
 }
 
 class FormChangeItemModifierTypeGenerator extends ModifierTypeGenerator {
-  constructor(rare: boolean) {
+  constructor(isRareFormChangeItem: boolean) {
     super((party: Pokemon[], pregenArgs?: any[]) => {
       if (pregenArgs && (pregenArgs.length === 1) && (pregenArgs[0] in FormChangeItem)) {
         return new FormChangeItemModifierType(pregenArgs[0] as FormChangeItem);
@@ -1167,7 +1167,7 @@ class FormChangeItemModifierTypeGenerator extends ModifierTypeGenerator {
         }
         return formChangeItemTriggers;
       }).flat())
-      ].flat().flatMap(fc => fc.item).filter(i => (i && i < 100) === rare);
+      ].flat().flatMap(fc => fc.item).filter(i => (i && i < 100) === isRareFormChangeItem);
       // convert it into a set to remove duplicate values, which can appear when the same species with a potential form change is in the party.
 
       if (!formChangeItemPool.length) {
diff --git a/src/modifier/modifier.ts b/src/modifier/modifier.ts
index 2cd96496f459..b699c2483c9f 100644
--- a/src/modifier/modifier.ts
+++ b/src/modifier/modifier.ts
@@ -2181,7 +2181,7 @@ export class PokemonNatureChangeModifier extends ConsumablePokemonModifier {
    * @returns
    */
   override apply(playerPokemon: PlayerPokemon): boolean {
-    playerPokemon.natureOverride = this.nature;
+    playerPokemon.customPokemonData.nature = this.nature;
     let speciesId = playerPokemon.species.speciesId;
     playerPokemon.scene.gameData.dexData[speciesId].natureAttr |= 1 << (this.nature + 1);
 
diff --git a/src/phases/encounter-phase.ts b/src/phases/encounter-phase.ts
index 84f07f3ee94f..b7071c4cc6fc 100644
--- a/src/phases/encounter-phase.ts
+++ b/src/phases/encounter-phase.ts
@@ -35,6 +35,7 @@ import { getEncounterText } from "#app/data/mystery-encounters/utils/encounter-d
 import { MysteryEncounterPhase } from "#app/phases/mystery-encounter-phases";
 import { getGoldenBugNetSpecies } from "#app/data/mystery-encounters/utils/encounter-pokemon-utils";
 import { Biome } from "#enums/biome";
+import { WEIGHT_INCREMENT_ON_SPAWN_MISS } from "#app/data/mystery-encounters/mystery-encounters";
 
 export class EncounterPhase extends BattlePhase {
   private loaded: boolean;
@@ -68,7 +69,7 @@ export class EncounterPhase extends BattlePhase {
       this.scene.executeWithSeedOffset(() => {
         const currentSessionEncounterType = battle.mysteryEncounterType;
         battle.mysteryEncounter = this.scene.getMysteryEncounter(currentSessionEncounterType);
-      }, battle.waveIndex << 4);
+      }, battle.waveIndex * 16);
     }
     const mysteryEncounter = battle.mysteryEncounter;
     if (mysteryEncounter) {
@@ -251,6 +252,13 @@ export class EncounterPhase extends BattlePhase {
         this.scene.updateModifiers(true);
       }*/
 
+    const { battleType, waveIndex } = this.scene.currentBattle;
+    if (this.scene.isMysteryEncounterValidForWave(battleType,  waveIndex) && !this.scene.currentBattle.isBattleMysteryEncounter()) {
+      // Increment ME spawn chance if an ME could have spawned but did not
+      // Only do this AFTER session has been saved to avoid duplicating increments
+      this.scene.mysteryEncounterSaveData.encounterSpawnChance += WEIGHT_INCREMENT_ON_SPAWN_MISS;
+    }
+
     for (const pokemon of this.scene.getParty()) {
       if (pokemon) {
         pokemon.resetBattleData();
diff --git a/src/phases/mystery-encounter-phases.ts b/src/phases/mystery-encounter-phases.ts
index 0166b2d6abd5..49e78fa5369a 100644
--- a/src/phases/mystery-encounter-phases.ts
+++ b/src/phases/mystery-encounter-phases.ts
@@ -402,7 +402,7 @@ export class MysteryEncounterBattlePhase extends Phase {
       }
     }
 
-    const availablePartyMembers = scene.getParty().filter(p => !p.isFainted());
+    const availablePartyMembers = scene.getParty().filter(p => p.isAllowedInBattle());
 
     if (!availablePartyMembers[0].isOnField()) {
       scene.pushPhase(new SummonPhase(scene, 0));
diff --git a/src/system/pokemon-data.ts b/src/system/pokemon-data.ts
index 8240b6bcf84d..cddc5798872f 100644
--- a/src/system/pokemon-data.ts
+++ b/src/system/pokemon-data.ts
@@ -12,7 +12,7 @@ import { loadBattlerTag } from "../data/battler-tags";
 import { Biome } from "#enums/biome";
 import { Moves } from "#enums/moves";
 import { Species } from "#enums/species";
-import { MysteryEncounterPokemonData } from "#app/data/mystery-encounters/mystery-encounter-pokemon-data";
+import { CustomPokemonData } from "#app/data/custom-pokemon-data";
 
 export default class PokemonData {
   public id: integer;
@@ -33,7 +33,6 @@ export default class PokemonData {
   public stats: integer[];
   public ivs: integer[];
   public nature: Nature;
-  public natureOverride: Nature | -1;
   public moveset: (PokemonMove | null)[];
   public status: Status | null;
   public friendship: integer;
@@ -54,14 +53,20 @@ export default class PokemonData {
   public fusionVariant: Variant;
   public fusionGender: Gender;
   public fusionLuck: integer;
-  public fusionMysteryEncounterPokemonData: MysteryEncounterPokemonData;
 
   public boss: boolean;
   public bossSegments?: integer;
 
   public summonData: PokemonSummonData;
+
   /** Data that can customize a Pokemon in non-standard ways from its Species */
-  public mysteryEncounterPokemonData: MysteryEncounterPokemonData;
+  public customPokemonData: CustomPokemonData;
+  public fusionCustomPokemonData: CustomPokemonData;
+
+  // Deprecated attributes, needed for now to allow SessionData migration (see PR#4619 comments)
+  public natureOverride: Nature | -1;
+  public mysteryEncounterPokemonData: CustomPokemonData | null;
+  public fusionMysteryEncounterPokemonData: CustomPokemonData | null;
 
   constructor(source: Pokemon | any, forHistory: boolean = false) {
     const sourcePokemon = source instanceof Pokemon ? source : null;
@@ -107,9 +112,13 @@ export default class PokemonData {
     this.fusionVariant = source.fusionVariant;
     this.fusionGender = source.fusionGender;
     this.fusionLuck = source.fusionLuck !== undefined ? source.fusionLuck : (source.fusionShiny ? source.fusionVariant + 1 : 0);
+    this.fusionCustomPokemonData = new CustomPokemonData(source.fusionCustomPokemonData);
     this.usedTMs = source.usedTMs ?? [];
 
-    this.mysteryEncounterPokemonData = new MysteryEncounterPokemonData(source.mysteryEncounterPokemonData);
+    this.customPokemonData = new CustomPokemonData(source.customPokemonData);
+
+    this.mysteryEncounterPokemonData = new CustomPokemonData(source.mysteryEncounterPokemonData);
+    this.fusionMysteryEncounterPokemonData = new CustomPokemonData(source.fusionMysteryEncounterPokemonData);
 
     if (!forHistory) {
       this.boss = (source instanceof EnemyPokemon && !!source.bossSegments) || (!this.player && !!source.boss);
diff --git a/src/system/version_migration/version_converter.ts b/src/system/version_migration/version_converter.ts
index f93e09b7a90e..e96afb5cbd4e 100644
--- a/src/system/version_migration/version_converter.ts
+++ b/src/system/version_migration/version_converter.ts
@@ -4,6 +4,9 @@ import { version } from "../../../package.json";
 // --- v1.0.4 (and below) PATCHES --- //
 import * as v1_0_4 from "./versions/v1_0_4";
 
+// --- v1.1.0 PATCHES --- //
+import * as v1_1_0 from "./versions/v1_1_0";
+
 const LATEST_VERSION = version.split(".").map(value => parseInt(value));
 
 /**
@@ -131,6 +134,10 @@ class SessionVersionConverter extends VersionConverter {
           this.callMigrators(data, v1_0_4.sessionMigrators);
         }
       }
+      if (curMinor <= 1) {
+        console.log("Applying v1.1.0 session data migration!");
+        this.callMigrators(data, v1_1_0.sessionMigrators);
+      }
     }
 
     console.log(`Session data successfully migrated to v${version}!`);
@@ -153,6 +160,10 @@ class SystemVersionConverter extends VersionConverter {
           this.callMigrators(data, v1_0_4.systemMigrators);
         }
       }
+      if (curMinor <= 1) {
+        console.log("Applying v1.1.0 system data migraton!");
+        this.callMigrators(data, v1_1_0.systemMigrators);
+      }
     }
 
     console.log(`System data successfully migrated to v${version}!`);
@@ -175,6 +186,10 @@ class SettingsVersionConverter extends VersionConverter {
           this.callMigrators(data, v1_0_4.settingsMigrators);
         }
       }
+      if (curMinor <= 1) {
+        console.log("Applying v1.1.0 settings data migraton!");
+        this.callMigrators(data, v1_1_0.settingsMigrators);
+      }
     }
 
     console.log(`System data successfully migrated to v${version}!`);
diff --git a/src/system/version_migration/versions/v1_1_0.ts b/src/system/version_migration/versions/v1_1_0.ts
new file mode 100644
index 000000000000..aac554c4531b
--- /dev/null
+++ b/src/system/version_migration/versions/v1_1_0.ts
@@ -0,0 +1,32 @@
+import { SessionSaveData } from "../../game-data";
+import { CustomPokemonData } from "#app/data/custom-pokemon-data";
+
+export const systemMigrators = [] as const;
+
+export const settingsMigrators = [] as const;
+
+export const sessionMigrators = [
+  /**
+   *  Converts old Pokemon natureOverride and mysteryEncounterData
+   *  to use the new conjoined {@linkcode Pokemon.customPokemonData} structure instead.
+   *  @param data {@linkcode SessionSaveData}
+   */
+  function migrateCustomPokemonDataAndNatureOverrides(data: SessionSaveData) {
+    // Fix Pokemon nature overrides and custom data migration
+    data.party.forEach(pokemon => {
+      if (pokemon["mysteryEncounterPokemonData"]) {
+        pokemon.customPokemonData = new CustomPokemonData(pokemon["mysteryEncounterPokemonData"]);
+        pokemon["mysteryEncounterPokemonData"] = null;
+      }
+      if (pokemon["fusionMysteryEncounterPokemonData"]) {
+        pokemon.fusionCustomPokemonData = new CustomPokemonData(pokemon["fusionMysteryEncounterPokemonData"]);
+        pokemon["fusionMysteryEncounterPokemonData"] = null;
+      }
+      pokemon.customPokemonData = pokemon.customPokemonData ?? new CustomPokemonData();
+      if (pokemon["natureOverride"] && pokemon["natureOverride"] >= 0) {
+        pokemon.customPokemonData.nature = pokemon["natureOverride"];
+        pokemon["natureOverride"] = -1;
+      }
+    });
+  }
+] as const;
diff --git a/src/test/mystery-encounter/encounters/bug-type-superfan-encounter.test.ts b/src/test/mystery-encounter/encounters/bug-type-superfan-encounter.test.ts
index 0dc02e03c6dc..e0f37c7e0458 100644
--- a/src/test/mystery-encounter/encounters/bug-type-superfan-encounter.test.ts
+++ b/src/test/mystery-encounter/encounters/bug-type-superfan-encounter.test.ts
@@ -476,10 +476,11 @@ describe("Bug-Type Superfan - Mystery Encounter", () => {
 
       expect(scene.ui.getMode()).to.equal(Mode.MODIFIER_SELECT);
       const modifierSelectHandler = scene.ui.handlers.find(h => h instanceof ModifierSelectUiHandler) as ModifierSelectUiHandler;
-      expect(modifierSelectHandler.options.length).toEqual(3);
+      expect(modifierSelectHandler.options.length).toEqual(4);
       expect(modifierSelectHandler.options[0].modifierTypeOption.type.id).toBe("MASTER_BALL");
-      expect(modifierSelectHandler.options[1].modifierTypeOption.type.id).toBe("MAX_LURE");
-      expect(modifierSelectHandler.options[2].modifierTypeOption.type.id).toBe("FORM_CHANGE_ITEM");
+      expect(modifierSelectHandler.options[1].modifierTypeOption.type.id).toBe("MEGA_BRACELET");
+      expect(modifierSelectHandler.options[2].modifierTypeOption.type.id).toBe("DYNAMAX_BAND");
+      expect(modifierSelectHandler.options[3].modifierTypeOption.type.id).toBe("FORM_CHANGE_ITEM");
     });
 
     it("should leave encounter without battle", async () => {
diff --git a/src/test/mystery-encounter/encounters/clowning-around-encounter.test.ts b/src/test/mystery-encounter/encounters/clowning-around-encounter.test.ts
index b92a4d96adce..82ed558e6dbb 100644
--- a/src/test/mystery-encounter/encounters/clowning-around-encounter.test.ts
+++ b/src/test/mystery-encounter/encounters/clowning-around-encounter.test.ts
@@ -118,11 +118,11 @@ describe("Clowning Around - Mystery Encounter", () => {
     });
     expect(config.pokemonConfigs?.[1]).toEqual({
       species: getPokemonSpecies(Species.BLACEPHALON),
-      mysteryEncounterPokemonData: expect.anything(),
+      customPokemonData: expect.anything(),
       isBoss: true,
       moveSet: [ Moves.TRICK, Moves.HYPNOSIS, Moves.SHADOW_BALL, Moves.MIND_BLOWN ]
     });
-    expect(config.pokemonConfigs?.[1].mysteryEncounterPokemonData?.types.length).toBe(2);
+    expect(config.pokemonConfigs?.[1].customPokemonData?.types.length).toBe(2);
     expect([
       Abilities.STURDY,
       Abilities.PICKUP,
@@ -139,8 +139,8 @@ describe("Clowning Around - Mystery Encounter", () => {
       Abilities.MAGICIAN,
       Abilities.SHEER_FORCE,
       Abilities.PRANKSTER
-    ]).toContain(config.pokemonConfigs?.[1].mysteryEncounterPokemonData?.ability);
-    expect(ClowningAroundEncounter.misc.ability).toBe(config.pokemonConfigs?.[1].mysteryEncounterPokemonData?.ability);
+    ]).toContain(config.pokemonConfigs?.[1].customPokemonData?.ability);
+    expect(ClowningAroundEncounter.misc.ability).toBe(config.pokemonConfigs?.[1].customPokemonData?.ability);
     await vi.waitFor(() => expect(moveInitSpy).toHaveBeenCalled());
     await vi.waitFor(() => expect(moveLoadSpy).toHaveBeenCalled());
     expect(onInitResult).toBe(true);
@@ -219,7 +219,7 @@ describe("Clowning Around - Mystery Encounter", () => {
       await game.phaseInterceptor.to(NewBattlePhase, false);
 
       const leadPokemon = scene.getParty()[0];
-      expect(leadPokemon.mysteryEncounterPokemonData?.ability).toBe(abilityToTrain);
+      expect(leadPokemon.customPokemonData?.ability).toBe(abilityToTrain);
     });
   });
 
@@ -340,9 +340,9 @@ describe("Clowning Around - Mystery Encounter", () => {
       scene.getParty()[2].moveset = [];
       await runMysteryEncounterToEnd(game, 3);
 
-      const leadTypesAfter = scene.getParty()[0].mysteryEncounterPokemonData?.types;
-      const secondaryTypesAfter = scene.getParty()[1].mysteryEncounterPokemonData?.types;
-      const thirdTypesAfter = scene.getParty()[2].mysteryEncounterPokemonData?.types;
+      const leadTypesAfter = scene.getParty()[0].customPokemonData?.types;
+      const secondaryTypesAfter = scene.getParty()[1].customPokemonData?.types;
+      const thirdTypesAfter = scene.getParty()[2].customPokemonData?.types;
 
       expect(leadTypesAfter.length).toBe(2);
       expect(leadTypesAfter[0]).toBe(Type.WATER);
diff --git a/src/test/mystery-encounter/encounters/the-strong-stuff-encounter.test.ts b/src/test/mystery-encounter/encounters/the-strong-stuff-encounter.test.ts
index f64124790b7e..4d95ff31d362 100644
--- a/src/test/mystery-encounter/encounters/the-strong-stuff-encounter.test.ts
+++ b/src/test/mystery-encounter/encounters/the-strong-stuff-encounter.test.ts
@@ -21,7 +21,7 @@ import { BerryModifier, PokemonBaseStatTotalModifier } from "#app/modifier/modif
 import { MysteryEncounterOptionMode } from "#enums/mystery-encounter-option-mode";
 import { MysteryEncounterTier } from "#enums/mystery-encounter-tier";
 import { initSceneWithoutEncounterPhase } from "#test/utils/gameManagerUtils";
-import { MysteryEncounterPokemonData } from "#app/data/mystery-encounters/mystery-encounter-pokemon-data";
+import { CustomPokemonData } from "#app/data/custom-pokemon-data";
 import { CommandPhase } from "#app/phases/command-phase";
 import { MovePhase } from "#app/phases/move-phase";
 import { SelectModifierPhase } from "#app/phases/select-modifier-phase";
@@ -109,7 +109,7 @@ describe("The Strong Stuff - Mystery Encounter", () => {
             species: getPokemonSpecies(Species.SHUCKLE),
             isBoss: true,
             bossSegments: 5,
-            mysteryEncounterPokemonData: new MysteryEncounterPokemonData({ spriteScale: 1.25 }),
+            customPokemonData: new CustomPokemonData({ spriteScale: 1.25 }),
             nature: Nature.BOLD,
             moveSet: [ Moves.INFESTATION, Moves.SALT_CURE, Moves.GASTRO_ACID, Moves.HEAL_ORDER ],
             modifierConfigs: expect.any(Array),
diff --git a/src/test/mystery-encounter/encounters/weird-dream-encounter.test.ts b/src/test/mystery-encounter/encounters/weird-dream-encounter.test.ts
index f4d055c69aab..0d463655a526 100644
--- a/src/test/mystery-encounter/encounters/weird-dream-encounter.test.ts
+++ b/src/test/mystery-encounter/encounters/weird-dream-encounter.test.ts
@@ -122,7 +122,7 @@ describe("Weird Dream - Mystery Encounter", () => {
       for (let i = 0; i < pokemonAfter.length; i++) {
         const newPokemon = pokemonAfter[i];
         expect(newPokemon.getSpeciesForm().speciesId).not.toBe(pokemonPrior[i].getSpeciesForm().speciesId);
-        expect(newPokemon.mysteryEncounterPokemonData?.types.length).toBe(2);
+        expect(newPokemon.customPokemonData?.types.length).toBe(2);
       }
 
       const plus90To110 = bstDiff.filter(bst => bst > 80);