diff --git a/test/battle/ability/defiant.c b/test/battle/ability/defiant.c
index 3463cad18d9a..d464dd2443f3 100644
--- a/test/battle/ability/defiant.c
+++ b/test/battle/ability/defiant.c
@@ -175,3 +175,104 @@ DOUBLE_BATTLE_TEST("Defiant is activated by Cotton Down for non-ally pokemon")
         EXPECT_EQ(playerRight->statStages[STAT_ATK], DEFAULT_STAT_STAGE + 2);
     }
 }
+
+SINGLE_BATTLE_TEST("Defiant activates before White Herb")
+{
+    u32 move;
+
+    PARAMETRIZE { move = MOVE_LEER; }
+    PARAMETRIZE { move = MOVE_GROWL; }
+
+    GIVEN {
+        PLAYER(SPECIES_MANKEY) { Ability(ABILITY_DEFIANT); Item(ITEM_WHITE_HERB); }
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(opponent, move); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, move, opponent);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, player);
+
+        ABILITY_POPUP(player, ABILITY_DEFIANT);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, player);
+        MESSAGE("Mankey's Attack sharply rose!");
+
+        if (move == MOVE_LEER) {
+            ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_HELD_ITEM_EFFECT, player);
+            MESSAGE("Mankey's White Herb restored its status!");
+        } else {
+            NONE_OF {
+                ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_HELD_ITEM_EFFECT, player);
+                MESSAGE("Mankey's White Herb restored its status!");
+            }
+        }
+    } THEN {
+        if (move == MOVE_LEER) {
+            EXPECT_EQ(player->statStages[STAT_DEF], DEFAULT_STAT_STAGE);
+            EXPECT_EQ(player->statStages[STAT_ATK], DEFAULT_STAT_STAGE + 2);
+        } else {
+            EXPECT_EQ(player->statStages[STAT_ATK], DEFAULT_STAT_STAGE + 1);
+        }
+    }
+}
+
+SINGLE_BATTLE_TEST("Defiant activates for each stat that is lowered")
+{
+    GIVEN {
+        ASSUME(gMovesInfo[MOVE_TICKLE].effect == EFFECT_TICKLE);
+        PLAYER(SPECIES_MANKEY) { Ability(ABILITY_DEFIANT); }
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_TICKLE); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_TICKLE, opponent);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, player);
+
+        MESSAGE("Mankey's Attack fell!");
+        ABILITY_POPUP(player, ABILITY_DEFIANT);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, player);
+        MESSAGE("Mankey's Attack sharply rose!");
+
+        MESSAGE("Mankey's Defense fell!");
+        ABILITY_POPUP(player, ABILITY_DEFIANT);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, player);
+        MESSAGE("Mankey's Attack sharply rose!");
+
+    } THEN {
+        EXPECT_EQ(player->statStages[STAT_ATK], DEFAULT_STAT_STAGE + 3);
+    }
+}
+
+SINGLE_BATTLE_TEST("Defiant doesn't activate if the pokemon lowers it's own stats")
+{
+    u32 move;
+
+    PARAMETRIZE { move = MOVE_SUPERPOWER; }
+    PARAMETRIZE { move = MOVE_CLOSE_COMBAT; }
+    PARAMETRIZE { move = MOVE_MAKE_IT_RAIN; }
+    PARAMETRIZE { move = MOVE_SPIN_OUT; }
+
+    GIVEN {
+        ASSUME(MoveHasAdditionalEffectSelf(MOVE_SUPERPOWER, MOVE_EFFECT_ATK_DEF_DOWN));
+        ASSUME(MoveHasAdditionalEffectSelf(MOVE_CLOSE_COMBAT, MOVE_EFFECT_DEF_SPDEF_DOWN));
+        ASSUME(MoveHasAdditionalEffectSelf(MOVE_MAKE_IT_RAIN, MOVE_EFFECT_SP_ATK_MINUS_1));
+        ASSUME(MoveHasAdditionalEffectSelf(MOVE_SPIN_OUT, MOVE_EFFECT_SPD_MINUS_2));
+        PLAYER(SPECIES_MANKEY) { Ability(ABILITY_DEFIANT); }
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(player, move); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, move, player);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, player);
+
+        NONE_OF {
+            ABILITY_POPUP(player, ABILITY_DEFIANT);
+            ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, player);
+            MESSAGE("Mankey's Attack sharply rose!");
+        }
+    } THEN {
+        if (move == MOVE_SUPERPOWER)
+            EXPECT_EQ(player->statStages[STAT_ATK], DEFAULT_STAT_STAGE - 1);
+        else
+            EXPECT_EQ(player->statStages[STAT_ATK], DEFAULT_STAT_STAGE);
+    }
+}