Pokemon Patched Crystal ROM

Pokemon Patched Crystal is a GBC ROM Hack by UberMedic7 of Pokemon Crystal in English. It was last updated on February 05, 2026.

Description

Pokemon Crystal is a great game, but sadly, it suffers from bugs and inaccuracies that are hard to notice initially. This hack fixes them but still retain the original feel and content of the game, which means this hack is more of a “patch” rather than a completely new game.

Features

• The entirety of bugs have been fixed
• Capture all 251 Pokémon, no trading with friends required
• Adjusted Time System, no longer will you have short mornings or long nights
• Celebi event restored, no more scrambled eggs
• Infinite use TMs, a collector’s dream
• Move Reminder to teach your Pokémon forgotten moves
• All Gym Leaders are available for a rematch, think you can win again?
• Extra Trainer Card page for Kanto badges and all 16 badges are now in color!
• Shiny variant display on Pokédex entries by pressing SELECT
• Easily change the time by pressing DOWN + B on the title screen

Changelog

V3.14

• Some bugfixes both new and undocumented ones!
• Fixed a bug were the catch rate formula breaks for Pokémon with max HP > 341
• Fixed a bug where the AI use of Full Heal or Full Restore does not cure Attack or Speed drops from burn or paralysis
• Fixed a bug where Metal Powder can increase damage taken with boosted (Special) Defense
• Fixed a bug where “Cautious” AI may fail to discourage residual moves
• Fixed a bug where the AI does not discourage Future Sight when it’s already been used
• Fixed a bug where the AI makes a false assumption about CheckTypeMatchup
• Fixed a bug where Confusion (status condition) damage is affected by type-boosting items and Explosion/Self-Destruct doubling
• Properly fixed the bugs involving Thick Club and Light Orb
• Restored the “Hall of Fame Master” title that can be acquired after 200 Hall of Fame entries

V3.13e

• Tweaked the pokedex entries of Lickitung and Doduo to use the metric system in their description
• Fixed a bug where ChooseWildEncounter doesn’t really validate the wild Pokémon species
• Fixed a bug where RandomUnseenWildMon always picks a morning Pokémon species
• Fixed a bug where BattleAnimCmd_ClearObjs only clears the first 6⅔ objects
• Removed Max Potion and Full Restore as Battle Tower rewards

V3.13d

• Fixed a bug where Mania is using the wrong dialogue when the player tries to return Shuckie with no other Pokémon
• Fixed a bug where Lock-On and Mind Reader don’t always bypass Fly and Dig
• Fixed an issue where setting a different Pokedex color theme would not apply on the UNOWN and SEARCH modes
• Tweaked the Moon Ball bugfix
• The Scientist trainer class no longer uses the Team Rocket battle theme music
• More documentation tweaks

Useful Links

Discord

Documentation

Github

Romhacking