diff --git a/packages/pokemon/src/__tests__/battle-helper.ts b/packages/pokemon/src/__tests__/battle-helper.ts
index 5a7262e07..192659f76 100644
--- a/packages/pokemon/src/__tests__/battle-helper.ts
+++ b/packages/pokemon/src/__tests__/battle-helper.ts
@@ -146,6 +146,8 @@ export interface BattleAssertions {
   turnIs(n: number): BattleAssertions
   /** Player party has N alive (hp > 0) Pokémon */
   aliveInParty(n: number): BattleAssertions
+  /** Player's move at index has expected pp and maxPp */
+  playerMovePp(moveIndex: number, pp: number, maxPp: number): BattleAssertions
   /** Generic assertion */
   satisfies(fn: (state: BattleState) => boolean, msg?: string): BattleAssertions
 }
@@ -297,6 +299,14 @@ class BattleAssertionsImpl implements BattleAssertions {
     return this
   }
 
+  playerMovePp(moveIndex: number, pp: number, maxPp: number) {
+    const move = this.s.playerPokemon.moves[moveIndex]
+    expect(move).toBeDefined()
+    expect(move!.pp).toBe(pp)
+    expect(move!.maxPp).toBe(maxPp)
+    return this
+  }
+
   satisfies(fn: (state: BattleState) => boolean, msg?: string) {
     expect(fn(this.s), msg).toBe(true)
     return this
diff --git a/packages/pokemon/src/__tests__/battle-scenarios.test.ts b/packages/pokemon/src/__tests__/battle-scenarios.test.ts
index 75be2d2c3..28f5a8f81 100644
--- a/packages/pokemon/src/__tests__/battle-scenarios.test.ts
+++ b/packages/pokemon/src/__tests__/battle-scenarios.test.ts
@@ -69,6 +69,23 @@ describe('Battle Scenario: 单回合事件', () => {
       .hasMove('opponent')
   })
 
+  battleTest('使用招式后 PP 递减', async () => {
+    const s = await battleScenario()
+      .party('charmander', 50, ['flamethrower', 'scratch'])
+      .opponent('squirtle', 50)
+      .start()
+
+    // Record initial PP
+    const initialState = s.state
+    const initialPp = initialState.playerPokemon.moves[0]!.pp
+    const maxPp = initialState.playerPokemon.moves[0]!.maxPp
+    expect(initialPp).toBe(maxPp)
+
+    const state = await s.useMove(0).runTurn()
+    // PP should decrease by 1, maxPp stays the same
+    s.expect(state).playerMovePp(0, initialPp - 1, maxPp)
+  })
+
   battleTest('等级碾压一击击杀', async () => {
     const s = await battleScenario()
       .party('charmander', 100, ['flamethrower'], { ev: { hp: 252, attack: 252, speed: 252 } })