diff --git a/include/constants/battle_config.h b/include/constants/battle_config.h
index a3ef7cc94..a8d6ebdf7 100644
--- a/include/constants/battle_config.h
+++ b/include/constants/battle_config.h
@@ -181,7 +181,7 @@
 #define B_FLASH_FIRE_FROZEN         GEN_7 // In Gen5+, Flash Fire can trigger even when frozen, when it couldn't before.
 #define B_SYNCHRONIZE_NATURE        GEN_8 // In Gen8, if a Pokémon with Synchronize is leading the party, it's 100% guaranteed that wild Pokémon will have the same ability, as opposed to 50% previously.
 #define B_SYNCHRONIZE_TOXIC         GEN_8 // In Gen5+, if a Pokémon with Synchronize is badly poisoned, the opponent will also become badly poisoned. Previously, the opponent would become regular poisoned.
-#define B_UPDATED_INTIMIDATE        GEN_8 // In Gen8, Intimidate doesn't work on opponents with the Inner Focus, Scrappy, Own Tempo or Oblivious abilities.
+#define B_UPDATED_INTIMIDATE        GEN_8 // In Gen8, Intimidate doesn't work on opponents with the Inner Focus, Scrappy, Own Tempo or Oblivious abilities. It also activates Rattled.
 
 // Item settings
 #define B_HP_BERRIES                GEN_7 // In Gen4+, berries which restore hp activate immediately after HP drops to half. In Gen3, the effect occurs at the end of the turn.
diff --git a/src/battle_util.c b/src/battle_util.c
index c0a7f2150..c18e4f113 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -1581,6 +1581,16 @@ void PrepareStringBattle(u16 stringId, u8 battler)
         else
             SET_STATCHANGER(STAT_SPATK, 2, FALSE);
     }
+#if  B_UPDATED_INTIMIDATE >= GEN_8
+    else if (stringId == STRINGID_PKMNCUTSATTACKWITH && targetAbility == ABILITY_RATTLED
+            && CompareStat(gBattlerTarget, STAT_SPEED, MAX_STAT_STAGE, CMP_LESS_THAN))
+    {
+        gBattlerAbility = gBattlerTarget;
+        BattleScriptPushCursor();
+        gBattlescriptCurrInstr = BattleScript_DefiantActivates;
+        SET_STATCHANGER(STAT_SPEED, 1, FALSE);
+    }
+#endif
 
     gActiveBattler = battler;
     BtlController_EmitPrintString(BUFFER_A, stringId);