diff --git a/data/battle_ai_scripts.s b/data/battle_ai_scripts.s
index 39e96f5cd2..91c0917771 100644
--- a/data/battle_ai_scripts.s
+++ b/data/battle_ai_scripts.s
@@ -554,6 +554,8 @@ AI_CBM_AttackDown: @ 82DC387
 
 AI_CBM_DefenseDown: @ 82DC39C
 	if_stat_level_equal AI_TARGET, STAT_DEF, 0, Score_Minus10
+	get_ability AI_TARGET
+	if_equal ABILITY_BIG_PECKS, Score_Minus10
 	goto CheckIfAbilityBlocksStatChange
 
 AI_CBM_SpeedDown: @ 82DC3A9
diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index 8e27a8cb0d..7e6b8f13d2 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -4273,7 +4273,8 @@ static void Cmd_playstatchangeanimation(void)
                         && ability != ABILITY_CLEAR_BODY
                         && ability != ABILITY_WHITE_SMOKE
                         && !(ability == ABILITY_KEEN_EYE && currStat == STAT_ACC)
-                        && !(ability == ABILITY_HYPER_CUTTER && currStat == STAT_ATK))
+                        && !(ability == ABILITY_HYPER_CUTTER && currStat == STAT_ATK)
+                        && !(ability == ABILITY_BIG_PECKS && currStat == STAT_DEF))
                 {
                     if (gBattleMons[gActiveBattler].statStages[currStat] > 0)
                     {
diff --git a/src/battle_util.c b/src/battle_util.c
index a9619d296b..eaa0543196 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -3082,9 +3082,12 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u8 ability, u8 special, u16 moveA
             gBattlescriptCurrInstr = BattleScript_SoundproofProtected;
             effect = 1;
         }
-        else if ((gLastUsedAbility == ABILITY_DAZZLING
+        else if (((gLastUsedAbility == ABILITY_DAZZLING
                    || (IsBattlerAlive(battler ^= BIT_FLANK) && GetBattlerAbility(battler) == ABILITY_DAZZLING)
                    )
+                   || (gLastUsedAbility == ABILITY_QUEENLY_MAJESTY
+                   || (IsBattlerAlive(battler ^= BIT_FLANK) && GetBattlerAbility(battler) == ABILITY_QUEENLY_MAJESTY)
+                   ))
                  && GetChosenMovePriority(battler) > 0
                  && GetBattlerSide(gBattlerAttacker) != GetBattlerSide(battler))
         {
@@ -3311,6 +3314,22 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u8 ability, u8 special, u16 moveA
                 effect++;
             }
             break;
+        case ABILITY_GOOEY:
+        case ABILITY_TANGLING_HAIR:
+            if (!(gMoveResultFlags & MOVE_RESULT_NO_EFFECT)
+             && gBattleMons[gBattlerAttacker].hp != 0
+             && !gProtectStructs[gBattlerAttacker].confusionSelfDmg
+             && TARGET_TURN_DAMAGED
+             && (gBattleMoves[move].flags & FLAG_MAKES_CONTACT))
+            {
+                gBattleScripting.moveEffect = MOVE_EFFECT_AFFECTS_USER | MOVE_EFFECT_SPD_MINUS_1;
+                PREPARE_ABILITY_BUFFER(gBattleTextBuff1, gLastUsedAbility);
+                BattleScriptPushCursor();
+                gBattlescriptCurrInstr = BattleScript_AbilityStatusEffect;
+                gHitMarker |= HITMARKER_IGNORE_SAFEGUARD;
+                effect++;
+            }
+            break;
         case ABILITY_ROUGH_SKIN:
         case ABILITY_IRON_BARBS:
             if (!(gMoveResultFlags & MOVE_RESULT_NO_EFFECT)