diff --git a/src/battle_ai_main.c b/src/battle_ai_main.c
index 2532424d24..92a39a54a6 100644
--- a/src/battle_ai_main.c
+++ b/src/battle_ai_main.c
@@ -4224,6 +4224,30 @@ static u32 AI_CalcMoveEffectScore(u32 battlerAtk, u32 battlerDef, u32 move)
                     ADJUST_SCORE(AWFUL_EFFECT);
             }
             break;
+    case EFFECT_FLOWER_SHIELD:
+        if (IS_BATTLER_OF_TYPE(battlerAtk, TYPE_GRASS))
+        {
+            ADJUST_SCORE(IncreaseStatUpScore(battlerAtk, battlerDef, STAT_CHANGE_DEF));
+        }
+        if (hasPartner && IS_BATTLER_OF_TYPE(BATTLE_PARTNER(battlerAtk), TYPE_GRASS))
+        {
+            ADJUST_SCORE(IncreaseStatUpScore(BATTLE_PARTNER(battlerAtk), battlerDef, STAT_CHANGE_DEF));
+        }
+        if (IS_BATTLER_OF_TYPE(FOE(battlerAtk), TYPE_GRASS))
+        {
+            if (aiData->abilities[FOE(battlerAtk)] == ABILITY_CONTRARY)
+                ADJUST_SCORE(WEAK_EFFECT);
+            else
+                ADJUST_SCORE(AWFUL_EFFECT);
+        }
+        if (IS_BATTLER_OF_TYPE(BATTLE_PARTNER(FOE(battlerAtk)), TYPE_GRASS))
+        {
+            if (aiData->abilities[BATTLE_PARTNER(FOE(battlerAtk))] == ABILITY_CONTRARY)
+                ADJUST_SCORE(WEAK_EFFECT);
+            else
+                ADJUST_SCORE(AWFUL_EFFECT);
+        }
+        break;
     case EFFECT_HAZE:
         if (AnyStatIsRaised(BATTLE_PARTNER(battlerAtk))
           || DoesPartnerHaveSameMoveEffect(BATTLE_PARTNER(battlerAtk), battlerDef, move, aiData->partnerMove))
diff --git a/test/battle/ai/can_use_all_moves.c b/test/battle/ai/can_use_all_moves.c
index 4d2ec08630..83ee14affa 100644
--- a/test/battle/ai/can_use_all_moves.c
+++ b/test/battle/ai/can_use_all_moves.c
@@ -456,7 +456,6 @@ AI_DOUBLE_BATTLE_TEST("AI can use all moves, 501-600")
         case EFFECT_ION_DELUGE:
         case EFFECT_AROMATIC_MIST:
         case EFFECT_POWDER:
-        case EFFECT_FLOWER_SHIELD:
         case EFFECT_ELECTRIFY:
 
         //TODO: AI TESTS
@@ -467,6 +466,7 @@ AI_DOUBLE_BATTLE_TEST("AI can use all moves, 501-600")
         case EFFECT_FAIRY_LOCK:
 
         // tests exist elsewhere
+        case EFFECT_FLOWER_SHIELD:
         case EFFECT_ROTOTILLER:
         case EFFECT_GRASSY_TERRAIN:
         case EFFECT_MISTY_TERRAIN:
diff --git a/test/battle/move_effect/flower_shield.c b/test/battle/move_effect/flower_shield.c
index 9eac08eb4d..8e9e8e334c 100644
--- a/test/battle/move_effect/flower_shield.c
+++ b/test/battle/move_effect/flower_shield.c
@@ -37,3 +37,19 @@ DOUBLE_BATTLE_TEST("Flower Shield raises the defense of all Grass-type Pokémon"
 }
 
 TO_DO_BATTLE_TEST("Flower Shield fails if there's no Grass-type Pokémon on the field")
+
+AI_DOUBLE_BATTLE_TEST("AI uses Flower Shield")
+{
+    GIVEN {
+        ASSUME(GetSpeciesType(SPECIES_TANGELA, 0) == TYPE_GRASS);
+        ASSUME(GetSpeciesType(SPECIES_WOBBUFFET, 0) != TYPE_GRASS);
+        ASSUME(GetSpeciesType(SPECIES_WOBBUFFET, 1) != TYPE_GRASS);
+        AI_FLAGS(AI_FLAG_CHECK_BAD_MOVE | AI_FLAG_CHECK_VIABILITY | AI_FLAG_TRY_TO_FAINT | AI_FLAG_OMNISCIENT);
+        PLAYER(SPECIES_WOBBUFFET) { Moves(MOVE_POUND, MOVE_CELEBRATE); }
+        PLAYER(SPECIES_WOBBUFFET) { Moves(MOVE_POUND, MOVE_CELEBRATE); }
+        OPPONENT(SPECIES_TANGELA) { Moves(MOVE_FLOWER_SHIELD, MOVE_POUND); }
+        OPPONENT(SPECIES_TANGELA);
+    } WHEN {
+        TURN {  EXPECT_MOVE(opponentLeft, MOVE_FLOWER_SHIELD); }
+    }
+}