pret / pokecrystal

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Disassembly of Pokémon Crystal, rebuilding the Game Boy Color ROMs from assembly source.

Why you might care

Lets reverse engineers and fan developers read and modify the game's original code, with source that builds byte-identical ROMs. Useful for studying GBZ80 game code or making hacks and ports; a base ROM is required and not included.

Alternatives

pokeredpokeemeraldpokeycrystal

stars, 24h · #7,812

+12

stars, 7 days · #10,811

+~40

stars, 30 days · #14,751

2.5k

★ total · +0% this week

992

forks · 59 open issues

Star history (as recorded here)

2026-10-20 · 2,535 ★ 2026-10-23 · 2,539 ★

LanguageAssembly

License—

Created2012-04-18 (14y ago)

Last push1d ago

Watchers105

OwnerOrganization

Seen on GitHub Trending

2026-10-23 — #12 daily in assembly · +4 ★
2026-10-23 — #6 weekly in assembly · +12 ★
2026-10-22 — #10 daily in assembly
2026-10-22 — #6 weekly in assembly · +11 ★
2026-10-21 — #12 daily in assembly · +1 ★
2026-10-21 — #17 monthly in assembly · +36 ★
2026-10-21 — #6 weekly in assembly · +12 ★
2026-10-20 — #12 daily in assembly · +2 ★
2026-10-20 — #17 monthly in assembly · +36 ★
2026-10-20 — #6 weekly in assembly · +14 ★

GitHub topics

disassembly gameboy-color gbz80 pokemon reverse-engineering

Links

GitHub: github.com/pret/pokecrystal
Homepage: https://pret.github.io/pokecrystal/
Releases · Issues · Hacker News mentions

README excerpt

# Pokémon Crystal [![Build Status][ci-badge]][ci]
This is a disassembly of Pokémon Crystal.
It builds the following ROMs:
- Pokemon - Crystal Version (UE) (V1.0) [C][!].gbc `sha1: f4cd194bdee0d04ca4eac29e09b8e4e9d818c133`
- Pokemon - Crystal Version (UE) (V1.1) [C][!].gbc `sha1: f2f52230b536214ef7c9924f483392993e226cfb`
- Pokemon - Crystal Version (A) [C][!].gbc `sha1: a0fc810f1d4e124434f7be2c989ab5b5892ddf36`
- CRYSTAL_ps3_010328d.bin `sha1: c60d57a24bbe8ecf7cba54ab3f90669f97bd330d`
- CRYSTAL_ps3_us_revise_010710d.bin `sha1: 391ae86b1d5a26db712ffe6c28bbf2a1f804c3c4`
- CGBBYTE1.784.patch `sha1: a25517f60ca0e887d39ec698aa56a0040532a4b3`
To set up the repository, see INSTALL.md.
## See also
- **FAQ**
- [**Documentation**][docs]
- [**Wiki**][wiki] (includes [tutorials][tutorials])
- [**Symbols**][symbols]
- [**Tools**][tools]
You can find us on Discord (pret, #pokecrystal).
For other pret projects, see pret.github.io.
[docs]: https://pret.github.io/pokecrystal/
[wiki]: https://github.com/pret/pokecrystal/wiki
[tutorials]: https://github.com/pret/pokecrystal/wiki/Tutorials
[symbols]: https://github.com/pret/pokecrystal/tree/symbols
[tools]: https://github.com/pret/gb-asm-tools
[ci]: https://github.com/pret/pokecrystal/actions
[ci-badge]: https://github.com/pret/pokecrystal/actions/workflows/main.yml/badge.svg

Blurb generated by claude-haiku-5-5 today. Star deltas marked ~ are extrapolated from partial history.