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Page: RoamersPlus ‐ multiple Roamers at once
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80x80 Sprites Ability Switcher via special Add A PokeVial Item Add A Pokemon Seller In Mauville Game Corner 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 New Partner Battle 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 (updated for INCGFX) 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 Battle Controllers Battle Engine Glossary Better White Out Money Calculation Branched Alolan Evolution 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 Customizing the boot flash memory error screen Daily Random Egg 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 Don't reset Pushable Boulders when moving around the map Dynamic Trade Names Dynamic overworld palette system Egg Type Palettes by Lunos Enable the Reset RTC Feature Enable trade with FRLG without beating the game Expanded Game Corner 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 Force Save Force load offscreen object events with a flag Forcing Battle Animations for Major Battles Full Screen Start Menu by Archie and Mudskip Gen 6 Exp Share Gen 6 style Exp. Share Alternative Option Get Match Calls Only If Caller Wants a Rematch Get Rid of Battery Run Dry Error Message Get Rid of Pokemon Disobeying You Getting Help with the Decomps Have Only One Starter Pokemon In Birch's Bag Holding Select Allows For A Second Register Item Home How Menus Work ‐ Index How Menus Work ‐ Part 1 How Menus Work ‐ Part 2 How Menus Work ‐ Part 3 How To Add New Items How the Game Works How to Support Savefile Backwards Compatibility How to add a new Pokémon species How to add a new ability How to add a new region map How to create a new regular trainer battle How to delete a map Implement Missing Text Function RESET_FONT Implementing Catch EXP Implementing ipatix's High Quality Audio Mixer Implementing the “textcolor” script command from FRLG and give object events their own text colour Improve Partner Battle Code Improve the Loading of Battle Environment (Terrain) Improving the WaitForVBlank function Increase item bag capacity Increase money limit Infinite TM usage Infinity Rare Candy Item Instead of Asking to Stop learning a New Move, You'll be Asked to Continue Learning Item Automatically Goes to PC if Bag is Full Item Limits In Battle Keep the Camera from Making Waves LGPE Style Bonus Premier Balls Latent Functions Learn moves upon evolution List Menu Text Coloring Make Cleanse Tag Avoid All Wild Encounters and Usable If Held By Anyone in Your Party; Make PokeDoll Do the Same for Trainers Seeing You Make Daycare Faster at Leveling Pokémon Make Key Items That Cannot Be Used In The Field Not Show A Use or Register Option Make L Button Be Turbo A When L=A Option Is Set Make Ledge Jumps Check Collision Make Long Grass Not Cut Off Objects at the Tile Border Make Mirage Island Appear with Pokemon in party or a flag being set Make Mirage Island Check PC Pokémon Make Move Relearner Teach Egg Moves With A Flag Make Multiple Secret Bases Make Norman's Slaking Have Ability Intimidate Make Pokeballs Usable Out Of Battle Make Pokemon Not Heal When Going into PC Make Pokemon that Require a Fateful Encounter to be Legal to Always Be Set to Legal Make space for EWRAM Data for Summary screen Make the Bag Able to Hold 120 Items Instead of 30 Make the Person in the Intro Match the the Save File Map Based Trainer Battle Music Move Item Multipage Options Menu Music Guide (m4a engine & poryaaaa) NPCs Give Pokemon Box RS Gift Eggs Name Rater Allows Traded Pokemon to be Renamed Nature Mints & Colored Stats New Birch's Briefcase With Fully Custom Starters by Archie and Mudskip New Custom Menu Border Themes (Basic) New Evolution Methods New Main Menu UI With Mugshot by Archie and Mudskip New Options Plus ‐ Multipage Options Menu with Faster Text, HP‐EXP Bar Speeds and Metric Nickname your Pokémon from the party menu Not showing dex entries until getting the Pokédex Omnidirectional Jump Optimization ‐ Remove Expensive and Redundant `BuildColorMaps()` Function Option to Skip Copyright and Intro Overview: Items and their Effects Overview: The Party Menu Overview∶ The Game Loop Overview∶ The Task System Overworld Expansion Per Shop\Mart Item Prices Plural Giveitem Pokecenters Disregard Eggs Porting Fired Tilesets to Emerald (alternate version) Prompt for reusing Repels Push B in wild battle moves to Run Push B to Toggle Running Shoes Pushing B When Asked To Stop Learning Move Will Cancel Teaching The Move Quickly Run from a Battle by Holding Right While the Wild Pokémon's Name Appears Raise Odds of Catching a Pokemon by Pressing B When the Ball Shakes Random Info, Tips, and Tricks Rearrange And Organise Flags Rearrange And Organise Vars Reclaim Unused Flags Reclaim Unused Vars Reflections Remove 'Select' Sound From Specific Map Events Remove Warp Fadescreen Remove badge boosts Remove the backup save file Remove the extra save confirmation Remove the functionally redundant move grammar tables Removing the Animation Affines Repeated Field Medicine Use Repurposing the Link Battle placeholders Reset Legendaries When Beating Elite Four Restoring the Shred Split Battle Transition Reuse filler save space for Variables and Flags Rewards For Beating Elite Four With And Owning Specific Pokemon by scolandrea Roamers On Map Show A Message Roamers RoamersPlus ‐ multiple Roamers at once Ruins of Alph Sliding Puzzles Saveblock Size Scanline Effects Set Metatile IDs From Another Map Set Up Item Balls on a Map Without Needing New Scripts Shifting to Pokémon Already in Battle Exits the Shift Menu Shiny Creation With a Flag Shop Items By Badge Count Show IVs EVs in Summary Screen Show Species That You're Switching For in the Party Menu Show Type Effectiveness In Battle Using Pre Existing Function and Disable in Option Menu Show a throbber animation while the game is saving Shuckle makes Berry Juice Single Mystery Random Starter Something doesn't work I need help etc. Spawn Invisible Player Speedy Nurse Joy Spinda Second Frame Spot Addition Stair Warps Supplementary Scripting Macros Surfing Dismount Ground Effects Temporarily Replace Player or Enemy Party Pokemon The Basics of Scripting Toggle Trainer Sight Trainer Backsprite Editing Trainer Class Based Poké Balls Trainer Scripts Trainers No Longer Spin to Face You Right As You Pass Them Trigger Map Scripts By Flag Triple layer metatiles Tutorials Tweaking the count of health beeps Uniquely Shuffle Array Update Sitrus Berry's effect to Gen 4 standard Use HMs Without Any Pokemon in your Party Knowing Them Useful Modding Tools Useful Scripting Specials Why You Should (Almost) Always Be Using 32‐Bit Variables in Your Code Why should I use this over binary hacking
5 RoamersPlus ‐ multiple Roamers at once
judicornadamsfoster edited this page 2026-09-14 21:18:29 +01:00
Table of Contents

original source: DarkDown's pokecommunity post

From DarkDown's post:

IMPORTANT:
If using the RHH expansion, my changes go to src/battle_ai_script_commands.c instead go into src/battle_ai_main.c

As most of you already know, in Pokemon Emerald, the player hears about the Eon Pokemon on TV and then chooses one of them to appear in the game.
The chosen Pokemon will then roam through certain routes and flee from battles instead of engaging the player in battle.
At its default state the game only allows for one roamer to exist at a time.
This branch allows you to set up as many roamers as you can fit into your saveblocks.
The Saveblock1 size of a Roamer has been reduced from 28 to 24 bytes. Each roamer beyond the first will of course take up an additional 24 bytes.

Other features:

Unbound Roaming
An optional feature that extends roaming to all routes. Normally roamers do not frequent most of the western routes.
Terrestrial Roamers
These roamers cannot be found on water tiles and do not roam on sea routes. Why is that Entei surfing?
Battling Roamers
Choose whether a roamer flees or battles normally.
Stalkers
These "roamers" will always move to your location. They leave the area after battle, but will follow you to the next area. Stalkers are not shown on the Pokedex by default.
Respawning Roamers
Select one of four respawning modes: no respawn, daily, weekly or instant respawn. Respawning roamers will not stop existing until they are caught.
Scaling Roamers
Adding a roamer with a level of 0 will create a scaling roamer. A scaling roamer's level increases based on your highest level party member and a constant modifier.
Includes an optional feature that allows roamers to evolve if they are high enough level.
Roamers will not level down or devolve if encountered with a weaker party.
Save/Load Persistent Locations
Roamer locations are added to SaveBlock1 and thus will not be randomized on game load.

A branch that does not include Persistent Locations can be found here. In this branch the Roamer struct takes up 16 bytes.

I included an example that, at the start of a new game or when InitRoamer() is called, creates the following roamers to showcase these features:

A basic Latias roamer that respawns weekly
A terrestrial Pikachu roamer that respawns daily
A terrestrial Pikachu that does not flee from battle
A scaling Weedle stalker that does not flee from battle and respawns instantly

All these species are also added to the Pokedex so you can track them.

How To Use:

pull from these updated branches:

Unbound / Terrestrial / Battling Roamers / Stalkers / Respawning / Scaling / Persistant Locations
compare

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

The above, but without Persistant Locations
compare

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

which ever branch you use, you will need to manually edit a few conflicts in 5 files.

How To Add Roamers

for each Roamer (or set of Roamers) you want to add, follow these steps

You don't have to have your Roamers all released at the same time.

The example below adds 2 sets of Roamers that will be unlocked at different times.

your chosen map script

In your map script file (or where you store your custom scripts)
however you want to activate it,
call the special in your scripts

	special InitJohtoRoamers

and

	special InitKantoRoamers

data/specials.inc

Add to end of file

	def_special InitKantoRoamers
	def_special InitJohtoRoamers

include/roamer.h

Add to the end of file, before #endif

void InitKantoRoamers(void);
void InitJohtoRoamers(void);

src/roamer.c

Add your function to the end of the file

In each funtion you should have:
at least one line stating the Roamer type
(DarkDown's examples)

  • TryAddRoamer(SPECIES_LATIAS, 40, FLEES, WEEKLY_RESPAWN);
  • TryAddTerrestrialRoamer(SPECIES_PIKACHU, 8, FLEES, DAILY_RESPAWN);
  • TryAddTerrestrialRoamer(SPECIES_PIKACHU, 15, DOES_NOT_FLEE, NO_RESPAWN);
  • TryAddStalker(SPECIES_WEEDLE, 0, DOES_NOT_FLEE, AMPHIBIOUS, INSTANT_RESPAWN);

if you want the Roamer to show as seen in the Pokedex (so you can follow where it is)

  • GetSetPokedexFlag(SpeciesToNationalPokedexNum(SPECIES_LATIAS), FLAG_SET_SEEN);

In each Roamer line you should have:

  • the species eg. SPECIES_LATIAS
  • the level from 1 to 100, use 0 for scaling levels
  • if you want the Roamer to be able to flee, choose from FLEES or DOES_NOT_FLEE
  • for TryAddStalker only, choose from AMPHIBIOUS or TERRESTRIAL depending if you want the Stalker to appear in land and water or just land
  • if you want the Roamer to be able to respawn, choose from NO_RESPAWN, DAILY_RESPAWN, WEEKLY_RESPAWN or INSTANT_RESPAWN

// adds the 3 Kanto Birds but does not add them to pokedex
void InitKantoRoamers(void)
{
    TryAddRoamer(SPECIES_ARTICUNO, 40, FLEES, NO_RESPAWN);
    TryAddRoamer(SPECIES_ZAPDOS, 40, FLEES, NO_RESPAWN);
    TryAddRoamer(SPECIES_MOLTRES, 40, FLEES, NO_RESPAWN);
}

// adds the 3 Johto Beasts and adds them to pokedex to track them
void InitJohtoRoamers(void)
{
    GetSetPokedexFlag(SpeciesToNationalPokedexNum(SPECIES_ENTEI), FLAG_SET_SEEN);
    GetSetPokedexFlag(SpeciesToNationalPokedexNum(SPECIES_RAIKOU), FLAG_SET_SEEN);
    GetSetPokedexFlag(SpeciesToNationalPokedexNum(SPECIES_SUICUNE), FLAG_SET_SEEN);
    TryAddTerrestrialRoamer(SPECIES_ENTEI, 40, FLEES, NO_RESPAWN);
    TryAddTerrestrialRoamer(SPECIES_RAIKOU, 40, FLEES, NO_RESPAWN);
    TryAddTerrestrialRoamer(SPECIES_SUICUNE, 40, FLEES, NO_RESPAWN);
}

end of guide

Sneed69's branches kept here for archive purposes:

Sneed69 branches

Unbound / Terrestrial / Battling Roamers / Stalkers / Respawning / Scaling / Persistant Locations
compare

git remote add Sneed69 https://github.com/Sneed69/pokeemerald.git  
git pull Sneed69 RoamersPlus

The above, but without Persistant Locations
compare

git remote add Sneed69 https://github.com/Sneed69/pokeemerald.git  
git pull Sneed69 RoamersPlus-No-Persistent-Locations

MANUAL CHANGES:

pokeemerald has renamed a few things since DarkDown posted his branch,
the following was renamed

src/pokedex_area_screen.c

in funtion static void FindMapsWithMon(u16 species)
search and replace:
for (i = 0; gWildMonHeaders[i].mapGroup != MAP_GROUP(UNDEFINED); i++)
change to:

        for (i = 0; gWildMonHeaders[i].mapGroup != MAP_GROUP(MAP_UNDEFINED); i++)

src/roamer.c

in function void RoamerMoveToOtherLocationSet(u8 index)
search for:
ROAMER(index)->locationMapGroup = MAP_GROUP(NONE);
ROAMER(index)->locationMapNum = MAP_NUM(NONE);
change to

            ROAMER(index)->locationMapGroup = MAP_GROUP(0x7F);  
            ROAMER(index)->locationMapNum = MAP_NUM(0x7F);

__
in function void RoamerMove(u8 index)
search for:
|| mapNum == MAP_NUM(UNDEFINED));
change to:

                        || mapNum == MAP_NUM(MAP_UNDEFINED));

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