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Have Only One Starter Pokemon In Birch's Bag

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judicornadamsfoster edited this page Aug 15, 2026 · 2 revisions

original source: LeMajaw

Have only one starter pokemon in Birch's bag

This code removes two of the pokeballs in Birch's bag and prevents the hand cursor moving to the positiions they used to be in

pokeemerald-0

How To Add To Your Decomp

pull from the branch or add manually using the code below

git remote add tenaya15 https://github.com/tenaya15/tenaya15emerald.git
git pull tenaya15 only_one_starter_pokemon

compare

src/starter_choose.c

in section static const u16 sStarterMon[STARTER_MON_COUNT] =
change all three starters to the same chosen starter (Eevee in this example)

every slot is Eevee, so the chosen starter is always Eevee
regardless of which Poké Ball index the UI reports back

    SPECIES_EEVEE,
    SPECIES_EEVEE,
    SPECIES_EEVEE,

__

in section void CB2_ChooseStarter(void)
delete the following lines (lines 449 to 452)
this removes the other 2 pokeballs from the bag

// Create three Poké Ball sprites
spriteId = CreateSprite(&sSpriteTemplate_Pokeball, sPokeballCoords[0][0], sPokeballCoords[0][1], 2);
gSprites[spriteId].sTaskId = taskId;
gSprites[spriteId].sBallId = 0;

and also delete the following lines (now lines 453 to 455)

spriteId = CreateSprite(&sSpriteTemplate_Pokeball, sPokeballCoords[2][0], sPokeballCoords[2][1], 2);
gSprites[spriteId].sTaskId = taskId;
gSprites[spriteId].sBallId = 2;

so the whole section should be:

void CB2_ChooseStarter(void) 
{
    u8 taskId;
    u8 spriteId;

    SetVBlankCallback(NULL);

    SetGpuReg(REG_OFFSET_DISPCNT, 0);
    SetGpuReg(REG_OFFSET_BG3CNT, 0);
    SetGpuReg(REG_OFFSET_BG2CNT, 0);
    SetGpuReg(REG_OFFSET_BG1CNT, 0);
    SetGpuReg(REG_OFFSET_BG0CNT, 0);

    ChangeBgX(0, 0, BG_COORD_SET);
    ChangeBgY(0, 0, BG_COORD_SET);
    ChangeBgX(1, 0, BG_COORD_SET);
    ChangeBgY(1, 0, BG_COORD_SET);
    ChangeBgX(2, 0, BG_COORD_SET);
    ChangeBgY(2, 0, BG_COORD_SET);
    ChangeBgX(3, 0, BG_COORD_SET);
    ChangeBgY(3, 0, BG_COORD_SET);

    DmaFill16(3, 0, VRAM, VRAM_SIZE);
    DmaFill32(3, 0, OAM, OAM_SIZE);
    DmaFill16(3, 0, PLTT, PLTT_SIZE);

    LZ77UnCompVram(gBirchBagGrass_Gfx, (void *)VRAM);
    LZ77UnCompVram(gBirchBagTilemap, (void *)(BG_SCREEN_ADDR(6)));
    LZ77UnCompVram(gBirchGrassTilemap, (void *)(BG_SCREEN_ADDR(7)));

    ResetBgsAndClearDma3BusyFlags(0);
    InitBgsFromTemplates(0, sBgTemplates, ARRAY_COUNT(sBgTemplates));
    InitWindows(sWindowTemplates);

    DeactivateAllTextPrinters();
    LoadUserWindowBorderGfx(0, 0x2A8, BG_PLTT_ID(13));
    ClearScheduledBgCopiesToVram();
    ScanlineEffect_Stop();
    ResetTasks();
    ResetSpriteData();
    ResetPaletteFade();
    FreeAllSpritePalettes();
    ResetAllPicSprites();

    LoadPalette(GetOverworldTextboxPalettePtr(), BG_PLTT_ID(14), PLTT_SIZE_4BPP);
    LoadPalette(gBirchBagGrass_Pal, BG_PLTT_ID(0), sizeof(gBirchBagGrass_Pal));
    LoadCompressedSpriteSheet(&sSpriteSheet_PokeballSelect[0]);
    LoadCompressedSpriteSheet(&sSpriteSheet_StarterCircle[0]);
    LoadSpritePalettes(sSpritePalettes_StarterChoose);
    BeginNormalPaletteFade(PALETTES_ALL, 0, 0x10, 0, RGB_BLACK);

    EnableInterrupts(DISPSTAT_VBLANK);
    SetVBlankCallback(VblankCB_StarterChoose);
    SetMainCallback2(CB2_StarterChoose);

    SetGpuReg(REG_OFFSET_WININ, WININ_WIN0_BG_ALL | WININ_WIN0_OBJ | WININ_WIN0_CLR);
    SetGpuReg(REG_OFFSET_WINOUT, WINOUT_WIN01_BG_ALL | WINOUT_WIN01_OBJ);
    SetGpuReg(REG_OFFSET_WIN0H, 0);
    SetGpuReg(REG_OFFSET_WIN0V, 0);
    SetGpuReg(REG_OFFSET_BLDCNT, BLDCNT_TGT1_BG1 | BLDCNT_TGT1_BG2 | BLDCNT_TGT1_BG3 | BLDCNT_TGT1_OBJ | BLDCNT_TGT1_BD | BLDCNT_EFFECT_DARKEN);
    SetGpuReg(REG_OFFSET_BLDALPHA, 0);
    SetGpuReg(REG_OFFSET_BLDY, 7);
    SetGpuReg(REG_OFFSET_DISPCNT, DISPCNT_WIN0_ON | DISPCNT_OBJ_ON | DISPCNT_OBJ_1D_MAP);

    ShowBg(0);
    ShowBg(2);
    ShowBg(3);

    taskId = CreateTask(Task_StarterChoose, 0);
    gTasks[taskId].tStarterSelection = 1;

    // Create hand sprite
    spriteId = CreateSprite(&sSpriteTemplate_Hand, 120, 56, 2);
    gSprites[spriteId].data[0] = taskId;

    spriteId = CreateSprite(&sSpriteTemplate_Pokeball, sPokeballCoords[1][0], sPokeballCoords[1][1], 2);
    gSprites[spriteId].sTaskId = taskId;
    gSprites[spriteId].sBallId = 1;

    sStarterLabelWindowId = WINDOW_NONE;
}

__

in section static void Task_HandleStarterChooseInput(u8 taskId)
replace the entire section with

{
    u8 selection = gTasks[taskId].tStarterSelection;

    if (JOY_NEW(A_BUTTON))
    {
        u8 spriteId;

        ClearStarterLabel();

        // Create white circle background
        spriteId = CreateSprite(&sSpriteTemplate_StarterCircle, sPokeballCoords[selection][0], sPokeballCoords[selection][1], 1);
        gTasks[taskId].tCircleSpriteId = spriteId;
		
        // Create Pokémon sprite
        // only one Poké Ball is shown, so left/right movement is
        // disabled - the cursor stays on the lone ball.
        spriteId = CreatePokemonFrontSprite(GetStarterPokemon(gTasks[taskId].tStarterSelection), sPokeballCoords[selection][0], sPokeballCoords[selection][1]);
        gSprites[spriteId].x2 = 4;
        gSprites[spriteId].y2 = 2;
        gSprites[spriteId].affineAnims = &sAffineAnims_StarterPokemon;;
        gSprites[spriteId].callback = SpriteCB_StarterPokemon;

        gTasks[taskId].tPkmnSpriteId = spriteId;
        gTasks[taskId].func = Task_WaitForStarterSprite;
    }
    // only one Poké Ball is shown, so left/right movement is
    // disabled - the cursor stays on the lone ball.
}

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