Infinity Rare Candy Item

METHOD 1:

a new item called "Infinity Candy" from pokeemerald++ by mynameisProjects

compare here / branch here

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include/item_use.h

add to end of file, before enum ItemTMHMOrEvolutionStone

void ItemUseOutOfBattle_InfinityCandy(u8 taskId);

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include/party_menu.h

add to end of file, before #endif // GUARD_PARTY_MENU_H

void ItemUseCB_InfinityCandy(u8 taskId, TaskFunc task);

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include/constants/items.h

replace an unused item (ITEM_066 102 used for this guide) with

#define ITEM_INFINITY_CANDY 102

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src/data/item_icon_table.h

replace the same item that you chose above with

	[ITEM_INFINITY_CANDY] = {gItemIcon_RareCandy, gItemIconPalette_GoldTeeth},

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src/data/items.h

replace the item chosen above with

    [ITEM_INFINITY_CANDY] =
    {
        .name = _("INFINITYCANDY"),
		.itemId = ITEM_INFINITY_CANDY,
        .price = 0,
        .description = sInfinityCandyDesc,
        .importance = 1,
        .pocket = POCKET_KEY_ITEMS,
        .type = ITEM_USE_PARTY_MENU,
        .fieldUseFunc = ItemUseOutOfBattle_RareCandy,
    },

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src/data/pokemon/item_effects.h

add to end of gItemEffect_* section, before const u8 *const gItemEffectTable[] =

const u8 gItemEffect_InfinityCandy[10] = {
    [3] = ITEM3_LEVEL_UP,
    [4] = ITEM4_REVIVE | ITEM4_HEAL_HP,
    [5] = ITEM5_FRIENDSHIP_ALL,
    [6] = ITEM6_HEAL_HP_LVL_UP,
    VITAMIN_FRIENDSHIP_CHANGE(7),
};

then add to the table const u8 *const gItemEffectTable[] =, before [LAST_BERRY_INDEX - ITEM_POTION] = NULL

	[ITEM_INFINITY_CANDY - ITEM_POTION] = gItemEffect_InfinityCandy,

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src/data/text/item_descriptions.h

add to end of file

static const u8 sInfinityCandyDesc[] = _(
    "Reusable. Raises a\n"
    "Pokémon's level\n"
    "by one.");

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src/item_use.c

add to end of file, before #undef tUsingRegisteredKeyItem

void ItemUseOutOfBattle_InfinityCandy(u8 taskId)
{
    gItemUseCB = ItemUseCB_InfinityCandy;
    SetUpItemUseCallback(taskId);
}

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src/party_menu.c

add to end of file:

void ItemUseCB_InfinityCandy(u8 taskId, TaskFunc task)
{
    struct Pokemon *mon = &gPlayerParty[gPartyMenu.slotId];
    struct PartyMenuInternal *ptr = sPartyMenuInternal;
    s16 *arrayPtr = ptr->data;
    u16 *itemPtr = &gSpecialVar_ItemId;
    bool8 cannotUseEffect;

    if (GetMonData(mon, MON_DATA_LEVEL) != MAX_LEVEL)
    {
        BufferMonStatsToTaskData(mon, arrayPtr);
        cannotUseEffect = ExecuteTableBasedItemEffect_(gPartyMenu.slotId, *itemPtr, 0);
        BufferMonStatsToTaskData(mon, &ptr->data[NUM_STATS]);
    }
    else
    {
        cannotUseEffect = TRUE;
    }
    PlaySE(SE_SELECT);
    if (cannotUseEffect)
    {
        gPartyMenuUseExitCallback = FALSE;
        DisplayPartyMenuMessage(gText_WontHaveEffect, TRUE);
        ScheduleBgCopyTilemapToVram(2);
        gTasks[taskId].func = task;
    }
    else
    {
        gPartyMenuUseExitCallback = TRUE;
        PlayFanfareByFanfareNum(FANFARE_LEVEL_UP);
        UpdateMonDisplayInfoAfterRareCandy(gPartyMenu.slotId, mon);
        GetMonNickname(mon, gStringVar1);
        ConvertIntToDecimalStringN(gStringVar2, GetMonData(mon, MON_DATA_LEVEL), STR_CONV_MODE_LEFT_ALIGN, 3);
        StringExpandPlaceholders(gStringVar4, gText_PkmnElevatedToLvVar2);
        DisplayPartyMenuMessage(gStringVar4, TRUE);
        ScheduleBgCopyTilemapToVram(2);
        gTasks[taskId].func = Task_DisplayLevelUpStatsPg1;
    }
}

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