Pokemon Blue G1S ROM

Pokemon Blue G1S is a GBA ROM Hack by Xyifer based on Pokemon Leaf Green in English. It was last updated on March 13, 2026.

Description

This project started when I decided that I dislike the vanilla FireRed art style enough to create a sprite replacement hack. This idea eventually grew through feature creep into a total re-de-make that aims to bring Red & Blue to the GBA, complete with widescreen and menus that don’t suck!

The tiny screen of the GBC makes me sad, your view is very limited and menus are necessarily cramped. Widescreen, the ability to connect to DS projects, good menus and full color.

The current version is playable all the way through Cerulean Cave. It’s 99% done. Too many projects promised greatness then died due to disinterest, showed amazing work and then fizzled out.

Features

Trainer parties, move stats, item prices and availability, learnsets, TMs, world layout, scripted events, dialogue, and more all match NTSC Red & Blue as closely as the author can manage. The author has played through the original games and G1S side-by-side 3 times in order to match the experience as closely as possible.

Although the project is 99% done, there are still some very important changes to be made and more testing to be done before declaring the project fully finished. Currently, link battles work while link trades do not. National Dex event and other post E4 events have not been completely erased/modified/verified.

Changelog

V11.0

• Total overhaul of the Battle UI’s Healthboxes, now using the Gen1 font!
• Partially-finished Pokedex category graphics rework.
• Fixed: Pokedex showing part of Pokemon sprite as window fill. Tile 1032 begone!
• Fixed: Healspots being incorrect and somehow sneaking past me during the Porymap6 update.
• Fixed: Game Corner TM Clerk listed correct TMs but gave incorrect TMs.

V10.0

• Replaced cries for all 151 Pokemon!
  
• New cave darkness effect in the style of Gen1!
• Updated to pokefirered Jan-2026, Porymap6 can now be used.
• Fixed: Some tilesets were somehow corrupted, resulting in visual errors on some maps.

V9.0

• Swapped the battle interface positions of ITEM and PKMN menu options, also replacing PKMN with special glyphs.
• Went through route encounter tables for surfing and fishing, making them more accurate.
• Slot machine total overhaul! New old look, new old reels!
• Background removed from Pokemon evolution scene.
• Removed cutscenes shown when using field moves.
• Lightly modified Safari Zone battle interface.
• Implemented new per-game diploma graphics.
• Replaced credits sequence.
• Modified battle transition animation tables to use 2 transitions.
• Fixed: Game Corner prize room coin display window cut off after overlapping prize selection window disappeared.
• Fixed: Missingno wild encounters in some areas.
• Fixed: Text being truncated due to faulty formatting.
• Fixed: Cerulean Cave entrance warp was 1 tile too low.
• Fixed: TELEPORT field move text not replaced.
• Fixed: Razor Wind was a generic 1-turn move.

Useful Links

Pokecommunity

Reddit

Gitlab

Youtube