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Page: Adding Multi region Support
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Ability Switcher via special Add A PokeVial Item Add Ability to Avoid Battle Damage in Debug Menu Add Ability to Swap Bikes Whenever Add Choice Specs Scarf hold item effects Add Description Submenu Add Difficulty Mode Add In‐Cart Rumble Add Nuzlocke Challenge Add PC Access in PokeNav Add Physical Special Split Add Sleep Mode Add Thief Ball Add a EV IV Stat Editor UI Add a debug menu Adding Multi region Support Adding Support for Connectivity with Other Hacks Whilst Maintaining Connectivity with Vanilla Adding Time Based Encounters Adding Walking Animations to All NPCs Adding a New Trainer Class Adding a New Trainer Front Picture Adding a Pokémon Type & Disabling the Mystery Type Adding new event object or overworld sprites All Trees Permanently Get Cut Allow All Pokemon to Evolve Without Trading Allow Both Latios and Latias Appear. Allow Feebas to be caught on any Valid Fishing Spot in Route 119 rather than only Three Allow Jumping Over Ledges with Acro Bike Allow Move Relearner to Teach Moves that Pre Evolutions Know Allow Running From Trainer Battles Allow running indoors Amulet Coin Effects If Anyone In Party is Holding It Automatically make the keyboard switch to lowercase after the first character Better White Out Money Calculation Button Press to Skip Copyright Screen Chain Fishing Change Enemy Trainer Parties Depending on Difficulty Change Someone's PC to Lanette's PC from the Start of the Game Change Starter Pokémon Change Time Based Evolution Times Change initial PC items Changing the Battle Music Depending on the Opponent Colored stats by nature in summary screen Converting to FR Tilesets Custom Battle Mugshots Custom Border Dimensions Debugging using gdb (Windows, WSL2, Visual Studio Code mGBA) Debugging using printf Disable Bag Use In Battle Disable Catching Pokemon Disable Pokémon animation on Birch's intro Pokémon Disabling Union Room check when entering Pokémon Centers Dynamic Trade Names Dynamic overworld palette system Enable the Reset RTC Feature Enable trade with FRLG without beating the game Expanding The Metatile Count Extra save space with three lines of code Faster HP Drain Feature Branches Fish Will Now Always Get on Hook Fix AI's Switch In Battle Fix Snow Weather Fixing the aspect ratio of the Pokémon logo on the title screen Forcing Battle Animations for Major Battles Full Screen Start Menu by Archie and Mudskip Gen 6 Exp Share Gen 6 style Exp. 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3 Adding Multi region Support
Josh edited this page 2021-05-25 22:34:19 +01:00

When making a hack, you may want the player to visit more than one region and with how Pokémon Emerald is set up, there is no way of identifying the region.

This tutorial will walk you through how to add the support for multiple regions through the available mapsection IDs. How to do this is simple.

Firstly, we need to open src/overworld.c as there are two functions we need to change.

Find LoadCurrentMapData and make the following change:

static void LoadCurrentMapData(void)
{
    sLastMapSectionId = gMapHeader.regionMapSectionId;
    gMapHeader = *Overworld_GetMapHeaderByGroupAndId(gSaveBlock1Ptr->location.mapGroup, gSaveBlock1Ptr->location.mapNum);
    gSaveBlock1Ptr->mapLayoutId = gMapHeader.mapLayoutId;
    gMapHeader.mapLayout = GetMapLayout();
+    gMapHeader.region = sMapsecToRegion[gMapHeader.regionMapSectionId];
}

This function handles the loading of the data for the currently loaded map. Right below that function, there is LoadSaveblockMapHeader, which handles loading the respective map data on save resume. We need to make the following change:

static void LoadSaveblockMapHeader(void)
{
    gMapHeader = *Overworld_GetMapHeaderByGroupAndId(gSaveBlock1Ptr->location.mapGroup, gSaveBlock1Ptr->location.mapNum);
    gMapHeader.mapLayout = GetMapLayout();
+    gMapHeader.region = sMapsecToRegion[gMapHeader.regionMapSectionId];
}

If you've noticed, we've added gMapHeader.region which loads data in sMapsecToRegion which we will be covering.

Next, we need to open include/global.fieldmap.h and find the struct MapHeader which should look like this:

struct MapHeader
{
    /* 0x00 */ const struct MapLayout *mapLayout;
    /* 0x04 */ const struct MapEvents *events;
    /* 0x08 */ const u8 *mapScripts;
    /* 0x0C */ const struct MapConnections *connections;
    /* 0x10 */ u16 music;
    /* 0x12 */ u16 mapLayoutId;
    /* 0x14 */ u8 regionMapSectionId;
    /* 0x15 */ u8 cave;
    /* 0x16 */ u8 weather;
    /* 0x17 */ u8 mapType;
    /* 0x18 */ u8 filler_18[2];
    /* 0x1A */ u8 flags;
    /* 0x1B */ u8 battleType;
};

u8 filler_18[2] is our point of interest here as it's simply used for padding the struct by two bytes. We will be using one of those bytes for our own region byte, like so:

struct MapHeader
{
    /* 0x00 */ const struct MapLayout *mapLayout;
    /* 0x04 */ const struct MapEvents *events;
    /* 0x08 */ const u8 *mapScripts;
    /* 0x0C */ const struct MapConnections *connections;
    /* 0x10 */ u16 music;
    /* 0x12 */ u16 mapLayoutId;
    /* 0x14 */ u8 regionMapSectionId;
    /* 0x15 */ u8 cave;
    /* 0x16 */ u8 weather;
    /* 0x17 */ u8 mapType;
-    /* 0x18 */ u8 filler_18[2];
+    /* 0x18 */ u8 filler_18;
+    /* 0x19 */ u8 region;
    /* 0x1A */ u8 flags;
    /* 0x1B */ u8 battleType;
};

Now, we are going to be adding a new array that will be used for our new region field. For the sake of this tutorial, we will be using Hoenn, Kanto and the Sevii Islands. Open include/overworld.h and add the following:

+enum {
+    REGION_HOENN,
+    REGION_KANTO,
+    REGION_SEVII
+};

These are IDs for the different regions with REGION_HOENN being 0, REGION_KANTO being 1 and REGION_SEVII being 2. We are now going to add the array. I prefer to put this into its own file, but you need to have the following somewhere in src/overworld.c:

+static const u8 sMapsecToRegion[] = {
+    [MAPSEC_LITTLEROOT_TOWN]            = REGION_HOENN,
+    [MAPSEC_OLDALE_TOWN]                = REGION_HOENN,
+    [MAPSEC_DEWFORD_TOWN]               = REGION_HOENN,
+    [MAPSEC_LAVARIDGE_TOWN]             = REGION_HOENN,
+    [MAPSEC_FALLARBOR_TOWN]             = REGION_HOENN,
+    [MAPSEC_VERDANTURF_TOWN]            = REGION_HOENN,
+    [MAPSEC_PACIFIDLOG_TOWN]            = REGION_HOENN,
+    [MAPSEC_PETALBURG_CITY]             = REGION_HOENN,
+    [MAPSEC_SLATEPORT_CITY]             = REGION_HOENN,
+    [MAPSEC_MAUVILLE_CITY]              = REGION_HOENN,
+    [MAPSEC_RUSTBORO_CITY]              = REGION_HOENN,
+    [MAPSEC_FORTREE_CITY]               = REGION_HOENN,
+    [MAPSEC_LILYCOVE_CITY]              = REGION_HOENN,
+    [MAPSEC_MOSSDEEP_CITY]              = REGION_HOENN,
+    [MAPSEC_SOOTOPOLIS_CITY]            = REGION_HOENN,
+    [MAPSEC_EVER_GRANDE_CITY]           = REGION_HOENN,
+    [MAPSEC_ROUTE_101]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_102]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_103]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_104]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_105]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_106]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_107]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_108]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_109]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_110]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_111]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_112]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_113]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_114]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_115]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_116]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_117]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_118]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_119]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_120]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_121]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_122]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_123]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_124]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_125]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_126]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_127]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_128]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_129]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_130]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_131]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_132]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_133]                  = REGION_HOENN,
+    [MAPSEC_ROUTE_134]                  = REGION_HOENN,
+    [MAPSEC_UNDERWATER_124]             = REGION_HOENN,
+    [MAPSEC_UNDERWATER_126]             = REGION_HOENN,
+    [MAPSEC_UNDERWATER_127]             = REGION_HOENN,
+    [MAPSEC_UNDERWATER_128]             = REGION_HOENN,
+    [MAPSEC_UNDERWATER_SOOTOPOLIS]      = REGION_HOENN,
+    [MAPSEC_GRANITE_CAVE]               = REGION_HOENN,
+    [MAPSEC_MT_CHIMNEY]                 = REGION_HOENN,
+    [MAPSEC_SAFARI_ZONE]                = REGION_HOENN,
+    [MAPSEC_BATTLE_FRONTIER]            = REGION_HOENN,
+    [MAPSEC_PETALBURG_WOODS]            = REGION_HOENN,
+    [MAPSEC_RUSTURF_TUNNEL]             = REGION_HOENN,
+    [MAPSEC_ABANDONED_SHIP]             = REGION_HOENN,
+    [MAPSEC_NEW_MAUVILLE]               = REGION_HOENN,
+    [MAPSEC_METEOR_FALLS]               = REGION_HOENN,
+    [MAPSEC_METEOR_FALLS2]              = REGION_HOENN,
+    [MAPSEC_MT_PYRE]                    = REGION_HOENN,
+    [MAPSEC_AQUA_HIDEOUT_OLD]           = REGION_HOENN,
+    [MAPSEC_SHOAL_CAVE]                 = REGION_HOENN,
+    [MAPSEC_SEAFLOOR_CAVERN]            = REGION_HOENN,
+    [MAPSEC_UNDERWATER_SEAFLOOR_CAVERN] = REGION_HOENN,
+    [MAPSEC_VICTORY_ROAD]               = REGION_HOENN,
+    [MAPSEC_MIRAGE_ISLAND]              = REGION_HOENN,
+    [MAPSEC_CAVE_OF_ORIGIN]             = REGION_HOENN,
+    [MAPSEC_SOUTHERN_ISLAND]            = REGION_HOENN,
+    [MAPSEC_FIERY_PATH]                 = REGION_HOENN,
+    [MAPSEC_FIERY_PATH2]                = REGION_HOENN,
+    [MAPSEC_JAGGED_PASS]                = REGION_HOENN,
+    [MAPSEC_JAGGED_PASS2]               = REGION_HOENN,
+    [MAPSEC_SEALED_CHAMBER]             = REGION_HOENN,
+    [MAPSEC_UNDERWATER_SEALED_CHAMBER]  = REGION_HOENN,
+    [MAPSEC_SCORCHED_SLAB]              = REGION_HOENN,
+    [MAPSEC_ISLAND_CAVE]                = REGION_HOENN,
+    [MAPSEC_DESERT_RUINS]               = REGION_HOENN,
+    [MAPSEC_ANCIENT_TOMB]               = REGION_HOENN,
+    [MAPSEC_INSIDE_OF_TRUCK]            = REGION_HOENN,
+    [MAPSEC_SKY_PILLAR]                 = REGION_HOENN,
+    [MAPSEC_SECRET_BASE]                = REGION_HOENN,
+    [MAPSEC_DYNAMIC]                    = REGION_HOENN,
+    [MAPSEC_PALLET_TOWN]                = REGION_KANTO,
+    [MAPSEC_VIRIDIAN_CITY]              = REGION_KANTO,
+    [MAPSEC_PEWTER_CITY]                = REGION_KANTO,
+    [MAPSEC_CERULEAN_CITY]              = REGION_KANTO,
+    [MAPSEC_LAVENDER_TOWN]              = REGION_KANTO,
+    [MAPSEC_VERMILION_CITY]             = REGION_KANTO,
+    [MAPSEC_CELADON_CITY]               = REGION_KANTO,
+    [MAPSEC_FUCHSIA_CITY]               = REGION_KANTO,
+    [MAPSEC_CINNABAR_ISLAND]            = REGION_KANTO,
+    [MAPSEC_INDIGO_PLATEAU]             = REGION_KANTO,
+    [MAPSEC_SAFFRON_CITY]               = REGION_KANTO,
+    [MAPSEC_ROUTE_4_FLYDUP]             = REGION_KANTO,
+    [MAPSEC_ROUTE_10_FLYDUP]            = REGION_KANTO,
+    [MAPSEC_ROUTE_1]                    = REGION_KANTO,
+    [MAPSEC_ROUTE_2]                    = REGION_KANTO,
+    [MAPSEC_ROUTE_3]                    = REGION_KANTO,
+    [MAPSEC_ROUTE_4]                    = REGION_KANTO,
+    [MAPSEC_ROUTE_5]                    = REGION_KANTO,
+    [MAPSEC_ROUTE_6]                    = REGION_KANTO,
+    [MAPSEC_ROUTE_7]                    = REGION_KANTO,
+    [MAPSEC_ROUTE_8]                    = REGION_KANTO,
+    [MAPSEC_ROUTE_9]                    = REGION_KANTO,
+    [MAPSEC_ROUTE_10]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_11]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_12]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_13]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_14]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_15]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_16]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_17]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_18]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_19]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_20]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_21]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_22]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_23]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_24]                   = REGION_KANTO,
+    [MAPSEC_ROUTE_25]                   = REGION_KANTO,
+    [MAPSEC_VIRIDIAN_FOREST]            = REGION_KANTO,
+    [MAPSEC_MT_MOON]                    = REGION_KANTO,
+    [MAPSEC_S_S_ANNE]                   = REGION_KANTO,
+    [MAPSEC_UNDERGROUND_PATH]           = REGION_KANTO,
+    [MAPSEC_UNDERGROUND_PATH_2]         = REGION_KANTO,
+    [MAPSEC_DIGLETTS_CAVE]              = REGION_KANTO,
+    [MAPSEC_KANTO_VICTORY_ROAD]         = REGION_KANTO,
+    [MAPSEC_ROCKET_HIDEOUT]             = REGION_KANTO,
+    [MAPSEC_SILPH_CO]                   = REGION_KANTO,
+    [MAPSEC_POKEMON_MANSION]            = REGION_KANTO,
+    [MAPSEC_KANTO_SAFARI_ZONE]          = REGION_KANTO,
+    [MAPSEC_POKEMON_LEAGUE]             = REGION_KANTO,
+    [MAPSEC_ROCK_TUNNEL]                = REGION_KANTO,
+    [MAPSEC_SEAFOAM_ISLANDS]            = REGION_KANTO,
+    [MAPSEC_POKEMON_TOWER]              = REGION_KANTO,
+    [MAPSEC_CERULEAN_CAVE]              = REGION_KANTO,
+    [MAPSEC_POWER_PLANT]                = REGION_KANTO,
+    [MAPSEC_ONE_ISLAND]                 = REGION_SEVII,
+    [MAPSEC_TWO_ISLAND]                 = REGION_SEVII,
+    [MAPSEC_THREE_ISLAND]               = REGION_SEVII,
+    [MAPSEC_FOUR_ISLAND]                = REGION_SEVII,
+    [MAPSEC_FIVE_ISLAND]                = REGION_SEVII,
+    [MAPSEC_SEVEN_ISLAND]               = REGION_SEVII,
+    [MAPSEC_SIX_ISLAND]                 = REGION_SEVII,
+    [MAPSEC_KINDLE_ROAD]                = REGION_SEVII,
+    [MAPSEC_TREASURE_BEACH]             = REGION_SEVII,
+    [MAPSEC_CAPE_BRINK]                 = REGION_SEVII,
+    [MAPSEC_BOND_BRIDGE]                = REGION_SEVII,
+    [MAPSEC_THREE_ISLE_PORT]            = REGION_SEVII,
+    [MAPSEC_SEVII_ISLE_6]               = REGION_SEVII,
+    [MAPSEC_SEVII_ISLE_7]               = REGION_SEVII,
+    [MAPSEC_SEVII_ISLE_8]               = REGION_SEVII,
+    [MAPSEC_SEVII_ISLE_9]               = REGION_SEVII,
+    [MAPSEC_RESORT_GORGEOUS]            = REGION_SEVII,
+    [MAPSEC_WATER_LABYRINTH]            = REGION_SEVII,
+    [MAPSEC_FIVE_ISLE_MEADOW]           = REGION_SEVII,
+    [MAPSEC_MEMORIAL_PILLAR]            = REGION_SEVII,
+    [MAPSEC_OUTCAST_ISLAND]             = REGION_SEVII,
+    [MAPSEC_GREEN_PATH]                 = REGION_SEVII,
+    [MAPSEC_WATER_PATH]                 = REGION_SEVII,
+    [MAPSEC_RUIN_VALLEY]                = REGION_SEVII,
+    [MAPSEC_TRAINER_TOWER]              = REGION_SEVII,
+    [MAPSEC_CANYON_ENTRANCE]            = REGION_SEVII,
+    [MAPSEC_SEVAULT_CANYON]             = REGION_SEVII,
+    [MAPSEC_TANOBY_RUINS]               = REGION_SEVII,
+    [MAPSEC_SEVII_ISLE_22]              = REGION_SEVII,
+    [MAPSEC_SEVII_ISLE_23]              = REGION_SEVII,
+    [MAPSEC_SEVII_ISLE_24]              = REGION_SEVII,
+    [MAPSEC_NAVEL_ROCK_FRLG]            = REGION_SEVII,
+    [MAPSEC_MT_EMBER]                   = REGION_SEVII,
+    [MAPSEC_BERRY_FOREST]               = REGION_SEVII,
+    [MAPSEC_ICEFALL_CAVE]               = REGION_SEVII,
+    [MAPSEC_ROCKET_WAREHOUSE]           = REGION_SEVII,
+    [MAPSEC_TRAINER_TOWER_2]            = REGION_SEVII,
+    [MAPSEC_DOTTED_HOLE]                = REGION_SEVII,
+    [MAPSEC_LOST_CAVE]                  = REGION_SEVII,
+    [MAPSEC_PATTERN_BUSH]               = REGION_SEVII,
+    [MAPSEC_ALTERING_CAVE_FRLG]         = REGION_SEVII,
+    [MAPSEC_TANOBY_CHAMBERS]            = REGION_SEVII,
+    [MAPSEC_THREE_ISLE_PATH]            = REGION_SEVII,
+    [MAPSEC_TANOBY_KEY]                 = REGION_SEVII,
+    [MAPSEC_BIRTH_ISLAND_FRLG]          = REGION_SEVII,
+    [MAPSEC_MONEAN_CHAMBER]             = REGION_SEVII,
+    [MAPSEC_LIPTOO_CHAMBER]             = REGION_SEVII,
+    [MAPSEC_WEEPTH_CHAMBER]             = REGION_SEVII,
+    [MAPSEC_DILFORD_CHAMBER]            = REGION_SEVII,
+    [MAPSEC_SCUFIB_CHAMBER]             = REGION_SEVII,
+    [MAPSEC_RIXY_CHAMBER]               = REGION_SEVII,
+    [MAPSEC_VIAPOIS_CHAMBER]            = REGION_SEVII,
+    [MAPSEC_EMBER_SPA]                  = REGION_SEVII,
+    [MAPSEC_SPECIAL_AREA]               = REGION_KANTO,
+    [MAPSEC_AQUA_HIDEOUT]               = REGION_HOENN,
+    [MAPSEC_MAGMA_HIDEOUT]              = REGION_HOENN,
+    [MAPSEC_MIRAGE_TOWER]               = REGION_HOENN,
+    [MAPSEC_BIRTH_ISLAND]               = REGION_SEVII,
+    [MAPSEC_FARAWAY_ISLAND]             = REGION_HOENN,
+    [MAPSEC_ARTISAN_CAVE]               = REGION_HOENN,
+    [MAPSEC_MARINE_CAVE]                = REGION_HOENN,
+    [MAPSEC_UNDERWATER_MARINE_CAVE]     = REGION_HOENN,
+    [MAPSEC_TERRA_CAVE]                 = REGION_HOENN,
+    [MAPSEC_UNDERWATER_105]             = REGION_HOENN,
+    [MAPSEC_UNDERWATER_125]             = REGION_HOENN,
+    [MAPSEC_UNDERWATER_129]             = REGION_HOENN,
+    [MAPSEC_DESERT_UNDERPASS]           = REGION_HOENN,
+    [MAPSEC_ALTERING_CAVE]              = REGION_HOENN,
+    [MAPSEC_NAVEL_ROCK]                 = REGION_SEVII,
+    [MAPSEC_TRAINER_HILL]               = REGION_HOENN
+};

Don't forget to declare it somewhere in src/overworld.c like so:

+static const u8 sMapsecToRegion[];

If I explained this correctly and didn't miss anything out, you should be able to compile the changes using make and the game will now use the region field for the current map the player is on. With this, you can do things like add battle music that changes depending on the region the player is in. I will update this tutorial at some point with how you can do this.

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