diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb9fec3e7e..70abeffd3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Pokeemerald-Expansion Changelogs
 
 ## 1.9.x
+- **[Version 1.9.4](docs/changelogs/1.9.x/1.9.4.md) - 🧹 Bugfix Release**
+- **[Version 1.9.3](docs/changelogs/1.9.x/1.9.3.md) - 🧹 Bugfix Release**
 - **[Version 1.9.2](docs/changelogs/1.9.x/1.9.2.md) - 🧹 Bugfix Release**
 - **[Version 1.9.1](docs/changelogs/1.9.x/1.9.1.md) - 🧹 Bugfix Release**
 - **[Version 1.9.0](docs/changelogs/1.9.x/1.9.0.md) - ✨ Feature Release**
diff --git a/docs/changelogs/1.9.x/1.9.4.md b/docs/changelogs/1.9.x/1.9.4.md
index 36dc2afc73..2a41988bd4 100644
--- a/docs/changelogs/1.9.x/1.9.4.md
+++ b/docs/changelogs/1.9.x/1.9.4.md
@@ -98,6 +98,7 @@
 * Fixes gems triggering on confusion damage by @AlexOn1ine in [#5723](https://github.com/rh-hideout/pokeemerald-expansion/pull/5723)
 * Fixes Kee Maranga and Enigma Berry by @AlexOn1ine in [#5727](https://github.com/rh-hideout/pokeemerald-expansion/pull/5727)
 * Fixes Blunder Policy by @AlexOn1ine in [#5722](https://github.com/rh-hideout/pokeemerald-expansion/pull/5722)
+* Fixes Rusted Shield/Sword allowed to be Knocked Off from Zamazenta/Zacian by @iriv24 in [#5750](https://github.com/rh-hideout/pokeemerald-expansion/pull/5750)
 
 ## 🤖 Battle AI 🤖
 ### Fixed
diff --git a/src/battle_util.c b/src/battle_util.c
index 01822691a3..bcd43f8962 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -10767,6 +10767,7 @@ bool32 DoesSpeciesUseHoldItemToChangeForm(u16 species, u16 heldItemId)
             case FORM_CHANGE_BATTLE_PRIMAL_REVERSION:
             case FORM_CHANGE_BATTLE_ULTRA_BURST:
             case FORM_CHANGE_ITEM_HOLD:
+            case FORM_CHANGE_BEGIN_BATTLE:
                 if (formChanges[i].param1 == heldItemId)
                     return TRUE;
                 break;
diff --git a/test/battle/move_effect/knock_off.c b/test/battle/move_effect/knock_off.c
index aa1081ff67..61bb062a25 100644
--- a/test/battle/move_effect/knock_off.c
+++ b/test/battle/move_effect/knock_off.c
@@ -202,6 +202,126 @@ SINGLE_BATTLE_TEST("Knock Off doesn't knock off items from Pokemon behind substi
     } WHEN {
         TURN { MOVE(opponent, MOVE_SUBSTITUTE); MOVE(player, MOVE_KNOCK_OFF); }
     } SCENE {
-        NOT MESSAGE("Wobbuffet knocked off the opposing Wobbuffet's Poké Ball");
+        NOT MESSAGE("Wobbuffet knocked off the opposing Wobbuffet's Poké Ball!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off does knock off Mega Stones from Pokemon that don't actually use them")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET) { Item(ITEM_ABSOLITE); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        MESSAGE("Wobbuffet knocked off the opposing Wobbuffet's Absolite!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off doesn't knock off Mega Stones from Pokemon that actually use them")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_ABSOL) { Item(ITEM_ABSOLITE); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        NOT MESSAGE("Wobbuffet knocked off the opposing Absol's Absolite!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off does knock off Orbs for Primal Reversion from Pokemon that don't actually use them")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET) { Item(ITEM_RED_ORB); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        MESSAGE("Wobbuffet knocked off the opposing Wobbuffet's Red Orb!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off doesn't knock off Orbs for Primal Reversion from Pokemon that actually use them")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_GROUDON) { Item(ITEM_RED_ORB); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        NOT MESSAGE("Wobbuffet knocked off the opposing Groudon's Red Orb!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off doesn't knock off Z-Crystals")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET) { Item(ITEM_ELECTRIUM_Z); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        NOT MESSAGE("Wobbuffet knocked off the opposing Wobbuffet's Electrium Z!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off doesn't knock off Ultranecrozium Z from Pokemon that actually use it")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_NECROZMA_DUSK_MANE) { Item(ITEM_ULTRANECROZIUM_Z); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        NOT MESSAGE("Wobbuffet knocked off the opposing Necrozma's Ultranecrozium Z!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off does knock off other form-change hold items from Pokemon that don't actually use them")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET) { Item(ITEM_SKY_PLATE); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        MESSAGE("Wobbuffet knocked off the opposing Wobbuffet's Sky Plate!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off doesn't knock off other form-change hold items from Pokemon that actually use them")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_ARCEUS) { Item(ITEM_SKY_PLATE); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        NOT MESSAGE("Wobbuffet knocked off the opposing Arceus's Sky Plate!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off does knock off begin-battle form-change hold items from Pokemon that don't actually use them")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET) { Item(ITEM_RUSTED_SHIELD); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        MESSAGE("Wobbuffet knocked off the opposing Wobbuffet's Rusted Shield!");
+    }
+}
+
+SINGLE_BATTLE_TEST("Knock Off doesn't knock off begin-battle form-change hold items from Pokemon that actually use them")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_ZAMAZENTA_HERO) { Item(ITEM_RUSTED_SHIELD); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_CELEBRATE); MOVE(player, MOVE_KNOCK_OFF); }
+    } SCENE {
+        NOT MESSAGE("Wobbuffet knocked off the opposing Zamazenta's Rusted Shield!");
     }
 }