Pokémon Legacy: Concord Edition
Game · GBA ROM hack
One game, four regions, any order: Kanto, Johto, Hoenn and Sinnoh joined into a single connected journey with 24 supported campaign orders.
A Game Boy Advance project built on pokeemerald-expansion. Every region is a fresh early-level campaign with its own badges, League and starter trio; what carries over is the trainer and, through Legacy Reversion, one chosen Pokémon that returns as the same individual. Most of the work is engineering the design: a versioned save layout with explicit migrations, a content registry that generates trainer and map data from JSON, and host-script plus ARM test suites that catch regressions before anything reaches an emulator.
Design & engineering highlights:
- Legacy Reversion: a chosen Pokémon returns at level 5 with IVs, nature, shininess, ball, nickname and OT intact
- All 24 region orders supported, with independent badges, story and League progress per region
- Content pipeline: authoring JSON and generators produce trainer and map headers, validated by host scripts
- 256 Gym history variants plus rivals, League and villain teams driven from one registry
- Versioned save format with explicit migrations and ARM test coverage
- Playtest-driven fixes, e.g. a scan that found unreachable NPCs behind counters across imported maps
Unofficial, non-commercial fan project made for fun. Not affiliated with or endorsed by Nintendo, Game Freak, Creatures Inc. or The Pokémon Company. Pokémon and its characters are trademarks of their respective owners.