Make Mirage Island Appear with Pokemon in party or a flag being set - pret/pokeemerald GitHub Wiki

Make Mirage Island appear with different methods.

All of these changes go in file src/time_events.c

---

appears with 1 specific Pokemon in your party

credit to resetes12 / Modern Emerald

replace all code in bool8 IsMirageIslandPresent(void) with:

{
    u16 rnd = GetMirageRnd() >> 16;
    int i;

    for (i = 0; i < PARTY_SIZE; i++)
        if (GetMonData(&gPlayerParty[i], MON_DATA_SPECIES, NULL) == SPECIES_JIRACHI)
            return TRUE;

    return FALSE;
}

---

appears with mutiple specified pokemon in party

credit to resetes12 / Modern Emerald

replace all code in bool8 IsMirageIslandPresent(void) with:

{
    u16 rnd = GetMirageRnd() >> 16;
    int i;

    for (i = 0; i < PARTY_SIZE; i++)
        if (GetMonData(&gPlayerParty[i], MON_DATA_SPECIES, NULL) == SPECIES_JIRACHI)
            return TRUE;
        else if (GetMonData(&gPlayerParty[i], MON_DATA_SPECIES, NULL) == SPECIES_CELEBI)
            return TRUE;

    return FALSE;
}

---

appears when a flag is set

first, in include/constants/flags.h, rename an unused flag
example:

#define FLAG_FORCE_MIRAGE_ISLAND  0x20

then, back in src/time_events.c replace all code in bool8 IsMirageIslandPresent(void) with:

{
    if (FlagGet(FLAG_FORCE_MIRAGE_ISLAND))
        return TRUE;
		

    return FALSE;
		
}

Then just create a script that does a setflag FLAG_FORCE_MIRAGE_ISLAND

---

having multiple methods

you can also keep the original method of having a pokemon with the correct random number and add one (or all) of the above methods by adding them as else if rather than just if
example:

{
    u16 rnd = GetMirageRnd() >> 16;
    int i;

    for (i = 0; i < PARTY_SIZE; i++)
        if (GetMonData(&gPlayerParty[i], MON_DATA_SPECIES) && (GetMonData(&gPlayerParty[i], MON_DATA_PERSONALITY) & 0xFFFF) == rnd)
            return TRUE;
        else if (GetMonData(&gPlayerParty[i], MON_DATA_SPECIES, NULL) == SPECIES_MEW)
            return TRUE;
        else if (GetMonData(&gPlayerParty[i], MON_DATA_SPECIES, NULL) == SPECIES_MEWTWO)
            return TRUE;
        else if (FlagGet(FLAG_FORCE_MIRAGE_ISLAND))
            return TRUE;

    return FALSE;
}