diff --git a/data/battle_scripts_1.s b/data/battle_scripts_1.s
index ac9e88bea8..730a9f56f1 100644
--- a/data/battle_scripts_1.s
+++ b/data/battle_scripts_1.s
@@ -9350,6 +9350,7 @@ BattleScript_GooeyActivates::
 	call BattleScript_AbilityPopUp
 	swapattackerwithtarget  @ for defiant, mirror armor
 	seteffectsecondary
+	swapattackerwithtarget
 	return
 
 BattleScript_AbilityStatusEffect::
diff --git a/test/battle/ability/mirror_armor.c b/test/battle/ability/mirror_armor.c
index 2c4d8d9a27..6de3530a77 100644
--- a/test/battle/ability/mirror_armor.c
+++ b/test/battle/ability/mirror_armor.c
@@ -195,3 +195,20 @@ DOUBLE_BATTLE_TEST("Mirror Armor lowers Speed of the partner Pokemon after Court
         MESSAGE("Wobbuffet's Speed fell!");
     }
 }
+
+SINGLE_BATTLE_TEST("Mirror Armor reflects Tangling Hair speed drop")
+{
+    KNOWN_FAILING;
+    GIVEN {
+        PLAYER(SPECIES_DUGTRIO) { Ability(ABILITY_TANGLING_HAIR); }
+        OPPONENT(SPECIES_CORVIKNIGHT) { Ability(ABILITY_MIRROR_ARMOR); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_TACKLE); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_TACKLE, opponent);
+        ABILITY_POPUP(player, ABILITY_TANGLING_HAIR);
+        NOT ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponent);
+        ABILITY_POPUP(opponent, ABILITY_MIRROR_ARMOR);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, player);
+    }
+}
diff --git a/test/battle/ability/tangling_hair.c b/test/battle/ability/tangling_hair.c
new file mode 100644
index 0000000000..5e204bc42c
--- /dev/null
+++ b/test/battle/ability/tangling_hair.c
@@ -0,0 +1,68 @@
+#include "global.h"
+#include "test/battle.h"
+
+ASSUMPTIONS
+{
+    ASSUME(gBattleMoves[MOVE_TACKLE].effect == EFFECT_HIT);
+    ASSUME(gBattleMoves[MOVE_TACKLE].power > 0);
+    ASSUME(gBattleMoves[MOVE_TACKLE].makesContact == TRUE);
+}
+
+
+SINGLE_BATTLE_TEST("Tangling Hair drops opposing mon's speed if ability user got hit by a contact move")
+{
+    u32 move;
+
+    PARAMETRIZE { move = MOVE_TACKLE; }
+    PARAMETRIZE { move = MOVE_SWIFT; }
+
+    GIVEN {
+        ASSUME(gBattleMoves[MOVE_SWIFT].makesContact == FALSE);
+        PLAYER(SPECIES_DUGTRIO) { Ability(ABILITY_TANGLING_HAIR); }
+        OPPONENT(SPECIES_WYNAUT);
+    } WHEN {
+        TURN { MOVE(opponent, move); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, move, opponent);
+        if (move == MOVE_TACKLE) {
+            ABILITY_POPUP(player, ABILITY_TANGLING_HAIR);
+            ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponent);
+            MESSAGE("Foe Wynaut's Speed fell!");
+        }
+    }
+}
+
+SINGLE_BATTLE_TEST("Tangling Hair does not cause Rocky Helmet miss activation")
+{
+    GIVEN {
+        ASSUME(gItems[ITEM_ROCKY_HELMET].holdEffect == HOLD_EFFECT_ROCKY_HELMET);
+        PLAYER(SPECIES_DUGTRIO) { Ability(ABILITY_TANGLING_HAIR); Item(ITEM_ROCKY_HELMET); }
+        OPPONENT(SPECIES_WYNAUT);
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_TACKLE); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_TACKLE, opponent);
+        ABILITY_POPUP(player, ABILITY_TANGLING_HAIR);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponent);
+        MESSAGE("Foe Wynaut's Speed fell!");
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_HELD_ITEM_EFFECT, player);
+        MESSAGE("Foe Wynaut was hurt by Dugtrio's Rocky Helmet!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Tangling Hair Speed stat drop triggers defiant")
+{
+    GIVEN {
+        PLAYER(SPECIES_DUGTRIO) { Ability(ABILITY_TANGLING_HAIR); }
+        OPPONENT(SPECIES_PAWNIARD) { Ability(ABILITY_DEFIANT); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_TACKLE); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_TACKLE, opponent);
+        ABILITY_POPUP(player, ABILITY_TANGLING_HAIR);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, opponent);
+        MESSAGE("Foe Pawniard's Speed fell!");
+        ABILITY_POPUP(opponent, ABILITY_DEFIANT);
+        MESSAGE("Foe Pawniard's Attack sharply rose!");
+    }
+}
diff --git a/test/battle/move_effect/rage_fist.c b/test/battle/move_effect/rage_fist.c
index 7a09461a4f..1d5feaad41 100644
--- a/test/battle/move_effect/rage_fist.c
+++ b/test/battle/move_effect/rage_fist.c
@@ -274,7 +274,6 @@ SINGLE_BATTLE_TEST("Rage Fist number of hits is copied by Transform")
 {
     s16 timesGotHit[2];
 
-    // KNOWN_FAILING; // After Transform , wrong move is used by transformed mon
     GIVEN {
         PLAYER(SPECIES_REGIROCK);
         OPPONENT(SPECIES_REGIROCK) { Moves(MOVE_RAGE_FIST, MOVE_CELEBRATE); }