diff --git a/include/constants/pokemon.h b/include/constants/pokemon.h
index 6912cfe6b..98b32ffd5 100644
--- a/include/constants/pokemon.h
+++ b/include/constants/pokemon.h
@@ -322,9 +322,8 @@
 #define FORM_ITEM_USE           2
 #define FORM_MOVE               3
 #define FORM_WITHDRAW           4
-#define FORM_ITEM_USE_TIME      5
-#define FORM_BATTLE_BEGIN       6
-#define FORM_BATTLE_END         7
+#define FORM_BATTLE_BEGIN       5
+#define FORM_BATTLE_END         6
 
 #define NUM_MALE_LINK_FACILITY_CLASSES   8
 #define NUM_FEMALE_LINK_FACILITY_CLASSES 8
diff --git a/src/data/items.h b/src/data/items.h
index 08060db77..6649fb24b 100644
--- a/src/data/items.h
+++ b/src/data/items.h
@@ -9071,7 +9071,7 @@ const struct Item gItems[] =
         .pocket = POCKET_KEY_ITEMS,
         .type = ITEM_USE_PARTY_MENU,
         .fieldUseFunc = ItemUseOutOfBattle_FormChange,
-        .secondaryId = FORM_ITEM_USE_TIME,
+        .secondaryId = FORM_ITEM_USE,
     },
 
     [ITEM_REVEAL_GLASS] =
diff --git a/src/data/pokemon/form_change_tables.h b/src/data/pokemon/form_change_tables.h
index ddcb4d9cb..2531a10c9 100644
--- a/src/data/pokemon/form_change_tables.h
+++ b/src/data/pokemon/form_change_tables.h
@@ -9,6 +9,8 @@ FORM_ITEM_HOLD:
 FORM_ITEM_USE:
     Form change activates when the item is used on the selected Pokémon.
     param1 = item to use
+    param2 = DAY if form change activates in the daytime, optional
+             NIGHT if form change activates at nighttime, optional
 
 FORM_MOVE:
     Form change activates when the Pokémon learns or forgets the move.
@@ -20,13 +22,6 @@ FORM_WITHDRAW:
     Form change activates when the Pokémon is withdrawn from the PC or Daycare.
     no parameters
 
-FORM_ITEM_USE_TIME:
-    Form change activates when the item is used on the selected Pokémon at the
-    appropriate time of day.
-    param1 = item to use
-    param2 = DAY if form change activates in the daytime
-             NIGHT if form change activates at nighttime
-
 FORM_BATTLE_BEGIN:
     Form change activates when the Pokémon is sent out at the beginning of a battle
     param1 = item to hold, optional
@@ -44,9 +39,9 @@ FORM_BATTLE_END:
 #define WHEN_LEARNED    0
 #define WHEN_FORGOTTEN  1
 
-// FORM_ITEM_USE_TIME param2 Arguments
-#define DAY    0
-#define NIGHT  1
+// FORM_ITEM_USE param2 Arguments
+#define DAY    1
+#define NIGHT  2
 
 #if P_NEW_POKEMON == TRUE
 static const struct FormChange sGiratinaFormChangeTable[] = {
@@ -56,7 +51,7 @@ static const struct FormChange sGiratinaFormChangeTable[] = {
 };
 
 static const struct FormChange sShayminFormChangeTable[] = {
-    {FORM_ITEM_USE_TIME, SPECIES_SHAYMIN_SKY, ITEM_GRACIDEA, DAY},
+    {FORM_ITEM_USE, SPECIES_SHAYMIN_SKY, ITEM_GRACIDEA, DAY},
     // {FORM_WITHDRAW, SPECIES_SHAYMIN},
     {FORM_CHANGE_END},
 };
diff --git a/src/pokemon.c b/src/pokemon.c
index 722eaafe8..b421e5ace 100644
--- a/src/pokemon.c
+++ b/src/pokemon.c
@@ -8273,30 +8273,30 @@ u16 GetFormChangeTargetSpeciesBoxMon(struct BoxPokemon *boxMon, u16 method, u32
                         targetSpecies = formChanges[i].targetSpecies;
                     break;
                 case FORM_ITEM_USE:
-                    if (arg == formChanges[i].param1)
-                        targetSpecies = formChanges[i].targetSpecies;
-                    break;
-                case FORM_MOVE:
-                    if (BoxMonKnowsMove(boxMon, formChanges[i].param1) != formChanges[i].param2)
-                        targetSpecies = formChanges[i].targetSpecies;
-                    break;
-                case FORM_ITEM_USE_TIME:
-                    RtcCalcLocalTime();
                     if (arg == formChanges[i].param1)
                     {
                         switch (formChanges[i].param2)
                         {
                         case DAY:
+                            RtcCalcLocalTime();
                             if (gLocalTime.hours >= 12 && gLocalTime.hours < 24)
                                 targetSpecies = formChanges[i].targetSpecies;
                             break;
                         case NIGHT:
+                            RtcCalcLocalTime();
                             if (gLocalTime.hours >= 0 && gLocalTime.hours < 12)
                                 targetSpecies = formChanges[i].targetSpecies;
                             break;
+                        default:
+                            targetSpecies = formChanges[i].targetSpecies;
+                            break;
                         }
                     }
                     break;
+                case FORM_MOVE:
+                    if (BoxMonKnowsMove(boxMon, formChanges[i].param1) != formChanges[i].param2)
+                        targetSpecies = formChanges[i].targetSpecies;
+                    break;
                 case FORM_BATTLE_BEGIN:
                 case FORM_BATTLE_END:
                     if (heldItem == formChanges[i].param1 || formChanges[i].param1 == ITEM_NONE)