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Pokémon Romhack Base, based off pret's pokeemerald decompilation. See the wiki for more info.
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Assembly 14.7%
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Fix Anticipation type effectiveness check (#7840)
2025-10-16 14:36:07 +02:00
.github Updated PR template to make existing credit policy clearer (#7864) 2025-10-08 13:53:25 -04:00
asm Fix multiple battle arena bugs (#7941) 2025-10-13 13:12:50 +02:00
constants Arbitrary trainer scripts + map script/trigger softlock prevention (#5033) 2025-01-08 10:27:00 +00:00
data Add missing end signal for AnimTask_SetAttackerInvisibleWaitForSignal (#7950) 2025-10-14 18:15:08 +02:00
dev_scripts Renamed folders and symbols to match species defines (#5581) 2024-10-27 20:15:11 +01:00
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include Fix Anticipation type effectiveness check (#7840) 2025-10-16 14:36:07 +02:00
libagbsyscall Fix $(AR) define, remove \u warns on macOS. 2021-01-04 11:35:59 -05:00
migration_scripts Adds conversion script for trainers.h (#7663) 2025-09-30 17:48:23 +02:00
sound 25/08/25 Master merge 2025-08-25 17:30:38 +02:00
src Fix Anticipation type effectiveness check (#7840) 2025-10-16 14:36:07 +02:00
test Fix Anticipation type effectiveness check (#7840) 2025-10-16 14:36:07 +02:00
tools update of sv.json to consider newest DLC changes (#7672) 2025-09-13 16:06:36 +02:00
.all-contributorsrc add Ddaretrogamer as a contributor for design (#7869) 2025-10-08 10:41:15 +02:00
.gitattributes Add missing files to .gitattributes. 2020-11-08 20:13:21 -05:00
.gitignore Remove competitive syntax config (#7154) 2025-07-12 13:03:36 -07:00
asmdiff.ps1 Remove debug printing 2019-04-07 19:18:42 -05:00
asmdiff.sh Pret merge (20th of June) (#4845) 2024-06-21 12:21:29 +02:00
audio_rules.mk Low Health Beeps Configuration (#6328) 2025-03-15 22:02:48 -07:00
build_tools.sh Update deprecated build_tools script 2019-08-27 09:15:44 -04:00
CHANGELOG.md Version 1.10.2 (#6144) 2025-01-30 18:38:28 -03:00
charmap.txt master merge 2025-07-19 17:01:18 +02:00
check_history.sh feat: check if inside of git repository before building (#4363) 2024-04-07 10:43:04 -04:00
CONTRIBUTING.md Updated CONTRIBUTING.md and Merge Freeze definition (#6952) 2025-05-22 09:29:13 +02:00
CREDITS.md add Ddaretrogamer as a contributor for design (#7869) 2025-10-08 10:41:15 +02:00
FEATURES.md Spruce up FEATURES.md (#7159) 2025-06-20 05:44:55 -07:00
graphics_file_rules.mk battle_interface: overhaul ability pop up (#7227) 2025-07-10 19:09:52 +02:00
INSTALL.md Update INSTALL.md (#7852) 2025-10-06 17:05:46 -07:00
json_data_rules.mk Merge branch 'master' into master-to-upcoming 2025-05-28 14:26:15 +02:00
ld_script_modern.ld Keep removed headers (#7261) 2025-07-02 09:06:23 +02:00
ld_script_test.ld Fix EWRAM_INIT in tests and add a default state to test runner main loop 2025-09-06 18:20:45 +02:00
make_tools.mk 11/08/25 Master to upcoming merge 2025-08-11 08:31:12 +02:00
Makefile make check TESTS="..." support for filenames and infix matches (#7536) 2025-08-13 10:39:55 +02:00
map_data_rules.mk Merge commit '07c897a' into pret-merge 2025-05-27 19:46:13 +02:00
README.md Expansion 1.13.2 release version 2025-10-01 11:09:29 +02:00
rom.sha1 Make rom.sha1 lowercase to fix erroneous comparison results on *nix 2017-09-06 09:20:49 -04:00
spritesheet_rules.mk Rock climb by ghoulslash (#7432) 2025-08-03 14:52:07 +02:00
trainer_rules.mk Remove competitive syntax config (#7154) 2025-07-12 13:03:36 -07:00

README.md

About pokeemerald-expansion

Gif that shows debugging functionality that is unique to pokeemerald-expansion such as rerolling Trainer ID, Cheat Start, PC from Debug Menu, Debug PC Fill, Pokémon Sprite Visualizer, Debug Warp to Map, and Battle Debug Menu Gif that shows overworld functionality that is unique to pokeemerald-expansion such as indoor running, BW2 style map popups, overworld followers, DNA Splicers, Gen 1 style fishing, OW Item descriptions, Quick Run from Battle, Use Last Ball, Wild Double Battles, and Catch from EXP Gif that shows off a number of modern Pokémon battle mechanics happening in the pokeemerald-expansion engine: 2 vs 1 battles, modern Pokémon, items, moves, abilities, fully customizable opponents and partners, Trainer Slides, and generational gimmicks

pokeemerald-expansion is a GBA ROM hack base that equips developers with a comprehensive toolkit for creating Pokémon ROM hacks. pokeemerald-expansion is built on top of pret's pokeemerald decompilation project. It is not a playable Pokémon game on its own.

Features

pokeemerald-expansion offers hundreds of features from various core series Pokémon games, along with popular quality-of-life enhancements designed to streamline development and improve the player experience. A full list of those features can be found in FEATURES.md.

Credits

If you use pokeemerald-expansion, please credit RHH (Rom Hacking Hideout). Optionally, include the version number for clarity.

Based off RHH's pokeemerald-expansion 1.13.2 https://github.com/rh-hideout/pokeemerald-expansion/

Please consider crediting all contributors involved in the project!

Choosing pokeemerald or pokeemerald-expansion

  • pokeemerald-expansion supports multiplayer functionality with other games built on pokeemerald-expansion. It is not compatible with official Pokémon games.
  • If compatibility with official games is important, use pokeemerald. Otherwise, we recommend using pokeemerald-expansion.
  • pokeemerald-expansion incorporates regular updates from pokeemerald, including bug fixes and documentation improvements.

Getting Started

❗❗ Important: Do not use GitHub's "Download Zip" option as it will not include commit history. This is necessary if you want to update or merge other feature branches.

If you're new to git and GitHub, Team Aqua's Asset Repo has a guide to forking and cloning the repository. Then you can follow one of the following guides:

📥 Installing pokeemerald-expansion

🏗️ Building pokeemerald-expansion

🚚 Migrating from pokeemerald

🚀 Updating pokeemerald-expansion

Documentation

For detailed documentation, visit the pokeemerald-expansion documentation page.

Contributions

If you are looking to report a bug, open a pull request, or request a feature, our CONTRIBUTING.md has guides for each.

Community

Our community uses the ROM Hacking Hideout (RHH) Discord server to communicate and organize. Most of our discussions take place there, and we welcome anybody to join us!