Placeholder moves can't be used in battle.

data/battle_scripts_1.s

@@ -9200,6 +9200,7 @@ BattleScript_ItemHealHP_Ret::
 BattleScript_SelectingNotAllowedMoveChoiceItem::
 	printselectionstring STRINGID_ITEMALLOWSONLYYMOVE
 	endselectionscript
+
 BattleScript_SelectingNotAllowedMoveChoiceItemInPalace::
 	printstring STRINGID_ITEMALLOWSONLYYMOVE
 	goto BattleScript_SelectingUnusableMoveInPalace
@@ -9207,6 +9208,7 @@ BattleScript_SelectingNotAllowedMoveChoiceItemInPalace::
 BattleScript_SelectingNotAllowedMoveGorillaTactics::
 	printselectionstring STRINGID_ABILITYALLOWSONLYMOVE
 	endselectionscript
+
 BattleScript_SelectingNotAllowedMoveGorillaTacticsInPalace::
 	printstring STRINGID_ABILITYALLOWSONLYMOVE
 	goto BattleScript_SelectingUnusableMoveInPalace
@@ -9214,10 +9216,19 @@ BattleScript_SelectingNotAllowedMoveGorillaTacticsInPalace::
 BattleScript_SelectingNotAllowedMoveAssaultVest::
 	printselectionstring STRINGID_ASSAULTVESTDOESNTALLOW
 	endselectionscript
+
 BattleScript_SelectingNotAllowedMoveAssaultVestInPalace::
 	printstring STRINGID_ASSAULTVESTDOESNTALLOW
 	goto BattleScript_SelectingUnusableMoveInPalace
 
+BattleScript_SelectingNotAllowedPlaceholder::
+	printselectionstring STRINGID_NOTDONEYET
+	endselectionscript
+
+BattleScript_SelectingNotAllowedPlaceholderInPalace::
+	printstring STRINGID_NOTDONEYET
+	goto BattleScript_SelectingUnusableMoveInPalace
+
 BattleScript_HangedOnMsg::
 	playanimation BS_TARGET, B_ANIM_HANGED_ON
 	printstring STRINGID_PKMNHUNGONWITHX

include/battle_scripts.h

@@ -277,6 +277,8 @@ extern const u8 BattleScript_HarvestActivates[];
 extern const u8 BattleScript_ImposterActivates[];
 extern const u8 BattleScript_SelectingNotAllowedMoveAssaultVest[];
 extern const u8 BattleScript_SelectingNotAllowedMoveAssaultVestInPalace[];
+extern const u8 BattleScript_SelectingNotAllowedPlaceholder[];
+extern const u8 BattleScript_SelectingNotAllowedPlaceholderInPalace[];
 extern const u8 BattleScript_SelectingNotAllowedMoveGravity[];
 extern const u8 BattleScript_MoveUsedGravityPrevents[];
 extern const u8 BattleScript_SelectingNotAllowedMoveGravityInPalace[];

include/battle_util.h

@@ -15,6 +15,8 @@
 #define MOVE_LIMITATION_BELCH                   (1 << 11)
 #define MOVE_LIMITATION_THROAT_CHOP             (1 << 12)
 #define MOVE_LIMITATION_STUFF_CHEEKS            (1 << 13)
+
+#define MOVE_LIMITATION_PLACEHOLDER             (1 << 15)
 #define MOVE_LIMITATIONS_ALL                    0xFFFF
 
 #define ABILITYEFFECT_ON_SWITCHIN                0

include/pokemon_summary_screen.h

@@ -6,6 +6,7 @@
 extern u8 gLastViewedMonIndex;
 
 extern const u8 *const gMoveDescriptionPointers[];
+extern const u8 gNotDoneYetDescription[];
 extern const u8 *const gNatureNamePointers[];
 
 void ShowPokemonSummaryScreen(u8 mode, void *mons, u8 monIndex, u8 maxMonIndex, void (*callback)(void));

src/battle_ai_main.c

@@ -2512,6 +2512,8 @@ static s16 AI_CheckBadMove(u8 battlerAtk, u8 battlerDef, u16 move, s16 score)
             if (gBattleMons[battlerAtk].hp <= gBattleMons[battlerAtk].maxHP / 3)
                 score -= 10;
             break;*/
+        case EFFECT_PLACEHOLDER:
+            return 0;   // cannot even select
     } // move effect checks
     
     if (score < 0)

src/battle_util.c

@@ -1930,6 +1930,20 @@ u8 TrySetCantSelectMoveBattleScript(void)
         }
     }
 
+    if (gBattleMoves[move].effect == EFFECT_PLACEHOLDER)
+    {
+        if (gBattleTypeFlags & BATTLE_TYPE_PALACE)
+        {
+            gPalaceSelectionBattleScripts[gActiveBattler] = BattleScript_SelectingNotAllowedPlaceholderInPalace;
+            gProtectStructs[gActiveBattler].palaceUnableToUseMove = TRUE;
+        }
+        else
+        {
+            gSelectionBattleScripts[gActiveBattler] = BattleScript_SelectingNotAllowedPlaceholder;
+            limitations++;
+        }
+    }
+
     return limitations;
 }
 
@@ -1949,6 +1963,9 @@ u8 CheckMoveLimitations(u8 battlerId, u8 unusableMoves, u16 check)
         // No PP
         else if (check & MOVE_LIMITATION_PP && gBattleMons[battlerId].pp[i] == 0)
             unusableMoves |= gBitTable[i];
+        // Placeholder
+        else if (check & MOVE_LIMITATION_PLACEHOLDER && gBattleMoves[gBattleMons[battlerId].moves[i]].effect == EFFECT_PLACEHOLDER)
+            unusableMoves |= gBitTable[i];
         // Disable
         else if (check & MOVE_LIMITATION_DISABLED && gBattleMons[battlerId].moves[i] == gDisableStructs[battlerId].disabledMove)
             unusableMoves |= gBitTable[i];

src/data/text/move_descriptions.h

@@ -2978,8 +2978,9 @@ static const u8 sEerieSpellDescription[] = _(
     "Attacks with psychic power.\n"
     "Foe's last move has 3 PP cut.");
 
-static const u8 sNotDoneYetDescription[] = _(
-    "Not done yet.");
+const u8 gNotDoneYetDescription[] = _(
+    "This move can't be used. Its\n"
+    "effect is in development.");
 
 // MOVE_NONE is ignored in this table. Make sure to always subtract 1 before getting the right pointer.
 const u8 *const gMoveDescriptionPointers[MOVES_COUNT - 1] =

src/menu_specialized.c

@@ -24,6 +24,7 @@
 #include "trig.h"
 #include "window.h"
 #include "constants/songs.h"
+#include "constants/battle_move_effects.h"
 #include "gba/io_reg.h"
 
 extern const struct CompressedSpriteSheet gMonFrontPicTable[];
@@ -807,7 +808,11 @@ static void MoveRelearnerLoadBattleMoveDescription(u32 chosenMove)
     }
     AddTextPrinterParameterized(0, FONT_NORMAL, str, 0x6A, 0x29, TEXT_SKIP_DRAW, NULL);
 
+    if (move->effect != EFFECT_PLACEHOLDER)
         str = gMoveDescriptionPointers[chosenMove - 1];
+    else
+        str = gNotDoneYetDescription;
+
     AddTextPrinterParameterized(0, FONT_NARROW, str, 0, 0x41, 0, NULL);
 }
 

src/pokemon_summary_screen.c

@@ -41,13 +41,14 @@
 #include "text.h"
 #include "tv.h"
 #include "window.h"
+#include "constants/battle_config.h"
+#include "constants/battle_move_effects.h"
 #include "constants/items.h"
 #include "constants/moves.h"
 #include "constants/party_menu.h"
 #include "constants/region_map_sections.h"
 #include "constants/rgb.h"
 #include "constants/songs.h"
-#include "constants/battle_config.h"
 
 enum {
     PSS_PAGE_INFO,
@@ -3730,15 +3731,21 @@ static void PrintContestMoveDescription(u8 moveSlot)
 static void PrintMoveDetails(u16 move)
 {
     u8 windowId = AddWindowFromTemplateList(sPageMovesTemplate, PSS_DATA_WINDOW_MOVE_DESCRIPTION);
+    u8 moveEffect;
     FillWindowPixelBuffer(windowId, PIXEL_FILL(0));
     if (move != MOVE_NONE)
     {
         if (sMonSummaryScreen->currPageIndex == PSS_PAGE_BATTLE_MOVES)
         {
+            moveEffect = gBattleMoves[move].effect;
             if (B_SHOW_SPLIT_ICON == TRUE)
                 ShowSplitIcon(GetBattleMoveSplit(move));
             PrintMovePowerAndAccuracy(move);
+            
+            if (moveEffect != EFFECT_PLACEHOLDER)
                 PrintTextOnWindow(windowId, gMoveDescriptionPointers[move - 1], 6, 1, 0, 0);
+            else
+                PrintTextOnWindow(windowId, gNotDoneYetDescription, 6, 1, 0, 0);
         }
         else
         {