diff --git a/src/data/ability.ts b/src/data/ability.ts
index 7d8220a629f..5bf02cabf6c 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -1285,6 +1285,9 @@ export class MoveEffectChanceMultiplierAbAttr extends AbAttr {
  * @see {@linkcode applyPreDefend}
  */
 export class IgnoreMoveEffectsAbAttr extends PreDefendAbAttr {
+  constructor(showAbility: boolean = false) {
+    super(showAbility);
+  }
 
   override canApplyPreDefend(pokemon: Pokemon, passive: boolean, simulated: boolean, attacker: Pokemon, move: Move | null, cancelled: Utils.BooleanHolder | null, args: any[]): boolean {
     return (args[0] as Utils.NumberHolder).value > 0;
@@ -4711,7 +4714,7 @@ export class ForceSwitchOutImmunityAbAttr extends AbAttr {
 
 export class ReduceBerryUseThresholdAbAttr extends AbAttr {
   constructor() {
-    super();
+    super(false);
   }
 
   override canApply(pokemon: Pokemon, passive: boolean, simulated: boolean, args: any[]): boolean {
diff --git a/src/modifier/modifier-type.ts b/src/modifier/modifier-type.ts
index b5574c02c8b..f9770e9c6cc 100644
--- a/src/modifier/modifier-type.ts
+++ b/src/modifier/modifier-type.ts
@@ -2000,7 +2000,7 @@ export const modifierTypes = {
     }),
 
   MYSTICAL_ROCK: () =>
-    new ModifierType(
+    new PokemonHeldItemModifierType(
       "modifierType:ModifierType.MYSTICAL_ROCK",
       "mystical_rock",
       (type, args) => new FieldEffectModifier(type, (args[0] as Pokemon).id),
diff --git a/src/ui/pokedex-ui-handler.ts b/src/ui/pokedex-ui-handler.ts
index 1f79d7006b0..d55b278a148 100644
--- a/src/ui/pokedex-ui-handler.ts
+++ b/src/ui/pokedex-ui-handler.ts
@@ -37,11 +37,10 @@ import { addWindow } from "./ui-theme";
 import type { OptionSelectConfig } from "./abstact-option-select-ui-handler";
 import { FilterText, FilterTextRow } from "./filter-text";
 import { allAbilities } from "#app/data/ability";
-import type { PassiveAbilities } from "#app/data/balance/passives";
 import { starterPassiveAbilities } from "#app/data/balance/passives";
 import { allMoves } from "#app/data/moves/move";
 import { speciesTmMoves } from "#app/data/balance/tms";
-import { pokemonStarters } from "#app/data/balance/pokemon-evolutions";
+import { pokemonPrevolutions, pokemonStarters } from "#app/data/balance/pokemon-evolutions";
 import { Biome } from "#enums/biome";
 import { globalScene } from "#app/global-scene";
 
@@ -1404,7 +1403,12 @@ export default class PokedexUiHandler extends MessageUiHandler {
 
       // Ability filter
       const abilities = [species.ability1, species.ability2, species.abilityHidden].map(a => allAbilities[a].name);
-      const passives = starterPassiveAbilities[starterId] ?? ({} as PassiveAbilities);
+      const passiveId = starterPassiveAbilities.hasOwnProperty(species.speciesId)
+        ? species.speciesId
+        : starterPassiveAbilities.hasOwnProperty(starterId)
+          ? starterId
+          : pokemonPrevolutions[starterId];
+      const passives = starterPassiveAbilities[passiveId];
 
       const selectedAbility1 = this.filterText.getValue(FilterTextRow.ABILITY_1);
       const fitsFormAbility1 = species.forms.some(form =>