diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index 60c105bdab..bd9e19b035 100644
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -2331,7 +2331,6 @@ static inline bool32 TryActivateWeakenessBerry(u32 battlerDef)
 {
     if (gSpecialStatuses[battlerDef].berryReduced && gBattleMons[battlerDef].item != ITEM_NONE)
     {
-        gSpecialStatuses[battlerDef].berryReduced = FALSE;
         gBattleScripting.battler = battlerDef;
         gLastUsedItem = gBattleMons[battlerDef].item;
         gBattleStruct->ateBerry[battlerDef & BIT_SIDE] |= 1u << gBattlerPartyIndexes[battlerDef];
@@ -6187,14 +6186,16 @@ static bool32 TryKnockOffBattleScript(u32 battlerDef)
     return FALSE;
 }
 
-#define SYMBIOSIS_CHECK(battler, ally)                             \
-    GetBattlerAbility(ally) == ABILITY_SYMBIOSIS                   \
-    && gBattleMons[battler].item == ITEM_NONE                      \
-    && gBattleMons[ally].item != ITEM_NONE                         \
-    && CanBattlerGetOrLoseItem(battler, gBattleMons[ally].item)    \
-    && CanBattlerGetOrLoseItem(ally, gBattleMons[ally].item)       \
-    && IsBattlerAlive(battler)                                     \
-    && IsBattlerAlive(ally)
+static inline bool32 TryTriggerSymbiosis(u32 battler, u32 ally)
+{
+    return GetBattlerAbility(ally) == ABILITY_SYMBIOSIS
+        && gBattleMons[battler].item == ITEM_NONE
+        && gBattleMons[ally].item != ITEM_NONE
+        && CanBattlerGetOrLoseItem(battler, gBattleMons[ally].item)
+        && CanBattlerGetOrLoseItem(ally, gBattleMons[ally].item)
+        && IsBattlerAlive(battler)
+        && IsBattlerAlive(ally);
+}
 
 static u32 GetNextTarget(u32 moveTarget, bool32 excludeCurrent)
 {
@@ -7354,7 +7355,7 @@ static void Cmd_moveend(void)
             {
                 if ((gSpecialStatuses[i].berryReduced
                       || (B_SYMBIOSIS_GEMS >= GEN_7 && gSpecialStatuses[i].gemBoost))
-                    && SYMBIOSIS_CHECK(i, BATTLE_PARTNER(i)))
+                    && TryTriggerSymbiosis(i, BATTLE_PARTNER(i)))
                 {
                     BestowItem(BATTLE_PARTNER(i), i);
                     gLastUsedAbility = gBattleMons[BATTLE_PARTNER(i)].ability;
@@ -9108,7 +9109,7 @@ static bool32 TrySymbiosis(u32 battler, u32 itemId)
         && (B_SYMBIOSIS_GEMS < GEN_7 || !(gSpecialStatuses[battler].gemBoost))
         && gCurrentMove != MOVE_FLING //Fling and damage-reducing berries are handled separately.
         && !gSpecialStatuses[battler].berryReduced
-        && SYMBIOSIS_CHECK(battler, BATTLE_PARTNER(battler)))
+        && TryTriggerSymbiosis(battler, BATTLE_PARTNER(battler)))
     {
         BestowItem(BATTLE_PARTNER(battler), battler);
         gLastUsedAbility = gBattleMons[BATTLE_PARTNER(battler)].ability;
@@ -17020,7 +17021,7 @@ void BS_TrySymbiosis(void)
     u32 battler = GetBattlerForBattleScript(cmd->battler);
     //called by Bestow, Fling, and Bug Bite, which don't work with Cmd_removeitem.
     u32 partner = BATTLE_PARTNER(battler);
-    if (SYMBIOSIS_CHECK(battler, partner))
+    if (TryTriggerSymbiosis(battler, partner))
     {
         BestowItem(partner, battler);
         gLastUsedAbility = gBattleMons[partner].ability;
diff --git a/test/battle/ability/symbiosis.c b/test/battle/ability/symbiosis.c
index 5c55370fe4..932008d9d7 100644
--- a/test/battle/ability/symbiosis.c
+++ b/test/battle/ability/symbiosis.c
@@ -21,7 +21,7 @@ DOUBLE_BATTLE_TEST("Symbiosis transfers its item to an ally after it consumes an
         MESSAGE("Oranguru passed its Toxic Orb to Wobbuffet through Symbiosis!");
         // end of turn, wobb gets poisoned
         MESSAGE("Wobbuffet was badly poisoned!");
-        STATUS_ICON(playerLeft, STATUS1_TOXIC_POISON); 
+        STATUS_ICON(playerLeft, STATUS1_TOXIC_POISON);
     } THEN {
         EXPECT_EQ(playerLeft->item, ITEM_TOXIC_ORB);
         EXPECT_EQ(playerRight->item, ITEM_NONE);
@@ -111,3 +111,24 @@ DOUBLE_BATTLE_TEST("Symbiosis triggers after partner flings its item")
         EXPECT_EQ(playerRight->item, ITEM_NONE);
     }
 }
+
+DOUBLE_BATTLE_TEST("Symbiosis transfers its item to an ally after it consumes a weakness berry")
+{
+    GIVEN {
+        ASSUME(gItemsInfo[ITEM_CHILAN_BERRY].holdEffect == HOLD_EFFECT_RESIST_BERRY);
+        PLAYER(SPECIES_WOBBUFFET) { Item(ITEM_CHILAN_BERRY); }
+        PLAYER(SPECIES_ORANGURU) { Ability(ABILITY_SYMBIOSIS); Item(ITEM_TOXIC_ORB); }
+        OPPONENT(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(opponentLeft, MOVE_TACKLE, target: playerLeft); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_HELD_ITEM_EFFECT, playerLeft);
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_TACKLE, opponentLeft);
+        ABILITY_POPUP(playerRight, ABILITY_SYMBIOSIS);
+        STATUS_ICON(playerLeft, STATUS1_TOXIC_POISON);
+    } THEN {
+        EXPECT_EQ(playerLeft->item, ITEM_TOXIC_ORB);
+        EXPECT_EQ(playerRight->item, ITEM_NONE);
+    }
+}