diff --git a/src/data/abilities/ability.ts b/src/data/abilities/ability.ts
index 120d1d413c4..22a2a466a86 100644
--- a/src/data/abilities/ability.ts
+++ b/src/data/abilities/ability.ts
@@ -3276,13 +3276,11 @@ export class IntimidateImmunityAbAttr extends AbAttr {
 export class PostIntimidateStatStageChangeAbAttr extends AbAttr {
   private stats: BattleStat[];
   private stages: number;
-  private overwrites: boolean;
 
-  constructor(stats: BattleStat[], stages: number, overwrites?: boolean) {
+  constructor(stats: BattleStat[], stages: number) {
     super(true);
     this.stats = stats;
     this.stages = stages;
-    this.overwrites = !!overwrites;
   }
 
   override apply(
@@ -3293,7 +3291,7 @@ export class PostIntimidateStatStageChangeAbAttr extends AbAttr {
     _args: any[],
   ): void {
     if (!simulated) {
-      globalScene.phaseManager.pushNew(
+      globalScene.phaseManager.unshiftNew(
         "StatStageChangePhase",
         pokemon.getBattlerIndex(),
         false,
@@ -3301,7 +3299,6 @@ export class PostIntimidateStatStageChangeAbAttr extends AbAttr {
         this.stages,
       );
     }
-    cancelled.value = this.overwrites;
   }
 }
 
@@ -3512,7 +3509,6 @@ export class PostSummonStatStageChangeAbAttr extends PostSummonAbAttr {
         const cancelled = new BooleanHolder(false);
         if (this.intimidate) {
           applyAbAttrs("IntimidateImmunityAbAttr", opponent, cancelled, simulated);
-          applyAbAttrs("PostIntimidateStatStageChangeAbAttr", opponent, cancelled, simulated);
 
           if (opponent.getTag(BattlerTagType.SUBSTITUTE)) {
             cancelled.value = true;
@@ -3527,6 +3523,7 @@ export class PostSummonStatStageChangeAbAttr extends PostSummonAbAttr {
             this.stages,
           );
         }
+        applyAbAttrs("PostIntimidateStatStageChangeAbAttr", opponent, cancelled, simulated);
       }
     }
   }
@@ -8886,7 +8883,8 @@ export function initAbilities() {
       .attr(PostSummonStatStageChangeOnArenaAbAttr, ArenaTagType.TAILWIND)
       .ignorable(),
     new Ability(AbilityId.GUARD_DOG, 9)
-      .attr(PostIntimidateStatStageChangeAbAttr, [ Stat.ATK ], 1, true)
+      .attr(PostIntimidateStatStageChangeAbAttr, [ Stat.ATK ], 1)
+      .attr(IntimidateImmunityAbAttr)
       .attr(ForceSwitchOutImmunityAbAttr)
       .ignorable(),
     new Ability(AbilityId.ROCKY_PAYLOAD, 9)
diff --git a/test/abilities/rattled.test.ts b/test/abilities/rattled.test.ts
new file mode 100644
index 00000000000..301e102511f
--- /dev/null
+++ b/test/abilities/rattled.test.ts
@@ -0,0 +1,125 @@
+import { MoveId } from "#enums/move-id";
+import { AbilityId } from "#enums/ability-id";
+import { SpeciesId } from "#enums/species-id";
+import GameManager from "#test/testUtils/gameManager";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+import { BattleType } from "#enums/battle-type";
+import { getStatKey, getStatStageChangeDescriptionKey, Stat } from "#enums/stat";
+import { BattlerIndex } from "#enums/battler-index";
+import i18next from "i18next";
+import { getPokemonNameWithAffix } from "#app/messages";
+
+describe("Abilities - Rattled", () => {
+  let phaserGame: Phaser.Game;
+  let game: GameManager;
+
+  beforeAll(() => {
+    phaserGame = new Phaser.Game({
+      type: Phaser.HEADLESS,
+    });
+  });
+
+  afterEach(() => {
+    game.phaseInterceptor.restoreOg();
+  });
+
+  beforeEach(() => {
+    game = new GameManager(phaserGame);
+    game.override
+      .ability(AbilityId.RATTLED)
+      .battleType(BattleType.TRAINER)
+      .disableCrits()
+      .battleStyle("single")
+      .enemySpecies(SpeciesId.DUSKULL)
+      .enemyAbility(AbilityId.INTIMIDATE)
+      .enemyPassiveAbility(AbilityId.NO_GUARD);
+  });
+
+  it.each<{ type: string; move: MoveId }>([
+    { type: "Bug", move: MoveId.TWINEEDLE },
+    { type: "Ghost", move: MoveId.ASTONISH },
+    { type: "Dark", move: MoveId.BEAT_UP },
+  ])("should raise the user's Speed by 1 stage for each hit of a $type-type move", async ({ move }) => {
+    game.override.enemyAbility(AbilityId.BALL_FETCH);
+    await game.classicMode.startBattle([SpeciesId.GIMMIGHOUL]);
+
+    game.move.use(MoveId.SPLASH);
+    await game.move.forceEnemyMove(move);
+    await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
+    game.phaseInterceptor.clearLogs();
+
+    await game.phaseInterceptor.to("MoveEffectPhase");
+    const enemyHits = game.field.getEnemyPokemon().turnData.hitCount;
+    await game.phaseInterceptor.to("MoveEndPhase");
+
+    // Rattled should've raised speed once per hit, displaying a separate message each time
+    const gimmighoul = game.field.getPlayerPokemon();
+    expect(gimmighoul.getStatStage(Stat.SPD)).toBe(enemyHits);
+    expect(game.phaseInterceptor.log.filter(p => p === "ShowAbilityPhase")).toHaveLength(enemyHits);
+    expect(game.phaseInterceptor.log.filter(p => p === "StatStageChangePhase")).toHaveLength(enemyHits);
+    const statChangeText = i18next.t(getStatStageChangeDescriptionKey(1, true), {
+      pokemonNameWithAffix: getPokemonNameWithAffix(gimmighoul),
+      stats: i18next.t(getStatKey(Stat.SPD)),
+      count: 1,
+    });
+    expect(game.textInterceptor.logs.filter(t => t === statChangeText)).toHaveLength(enemyHits);
+  });
+
+  it.each<{ type: string; move: MoveId }>([
+    { type: "Bug", move: MoveId.POWDER },
+    { type: "Ghost", move: MoveId.CONFUSE_RAY },
+    { type: "Dark", move: MoveId.TAUNT },
+  ])("should not trigger from $type-type status moves", async ({ move }) => {
+    game.override.enemyAbility(AbilityId.BALL_FETCH);
+    await game.classicMode.startBattle([SpeciesId.GIMMIGHOUL]);
+
+    game.move.use(MoveId.SPLASH);
+    await game.move.forceEnemyMove(move);
+    await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
+    await game.phaseInterceptor.to("MoveEndPhase");
+
+    const gimmighoul = game.field.getPlayerPokemon();
+    expect(gimmighoul.getStatStage(Stat.SPD)).toBe(0);
+    expect(game.phaseInterceptor.log).not.toContain("ShowAbilityPhase");
+    expect(game.phaseInterceptor.log).not.toContain("StatStageChangePhase");
+  });
+
+  it("should activate after Intimidate attack drop on initial send out", async () => {
+    // `runToSummon` used instead of `startBattle` to avoid skipping past initial "post send out" effects
+    await game.classicMode.runToSummon([SpeciesId.GIMMIGHOUL]);
+
+    // Intimidate
+    await game.phaseInterceptor.to("StatStageChangePhase");
+
+    const playerPokemon = game.field.getPlayerPokemon();
+    expect(playerPokemon.getStatStage(Stat.ATK)).toBe(-1);
+    expect(playerPokemon.getStatStage(Stat.SPD)).toBe(0);
+    game.phaseInterceptor.clearLogs();
+
+    // Rattled
+    await game.phaseInterceptor.to("StatStageChangePhase");
+
+    expect(playerPokemon.getStatStage(Stat.ATK)).toBe(-1);
+    expect(playerPokemon.getStatStage(Stat.SPD)).toBe(1);
+    // Nothing but show/hide ability phases should be visible
+    for (const log of game.phaseInterceptor.log) {
+      expect(log).toBeOneOf(["ShowAbilityPhase", "HideAbilityPhase", "StatStageChangePhase", "MessagePhase"]);
+    }
+  });
+
+  it("should activate after Intimidate from enemy switch", async () => {
+    await game.classicMode.startBattle([SpeciesId.GIMMIGHOUL, SpeciesId.BULBASAUR]);
+
+    game.move.use(MoveId.SPLASH);
+    game.forceEnemyToSwitch();
+    await game.phaseInterceptor.to("StatStageChangePhase");
+
+    const playerPokemon = game.field.getPlayerPokemon();
+    expect(playerPokemon.getStatStage(Stat.ATK)).toBe(-2);
+    expect(playerPokemon.getStatStage(Stat.SPD)).toBe(1);
+
+    await game.phaseInterceptor.to("StatStageChangePhase");
+    expect(playerPokemon.getStatStage(Stat.SPD)).toBe(2);
+  });
+});