Pokemon Polished Crystal

Most Gen 2 hacks either keep the old mechanics or abandon the Game Boy Color for a GBA engine. Pokemon Polished Crystal does neither: it is a Pokemon Crystal hack built on the pret disassembly that pulls almost two decades of series changes back into a GBC game. Rangi42 owns the open-source repository, and the project is developed by a small team with contributions from the wider community.

The goal stated in the project's README is to fix the original's bugs, adopt the official changes made since 2001 and add original ideas on top. In practice that means the physical/special split, the Fairy type, abilities and natures, an updated battle engine with modern move behaviour, 73 new moves, 75 reusable TMs and 31 move tutors. Shininess, gender and natures are no longer tied to DVs; DVs now only control a subtle colour variation, so two Pokemon of the same species can look slightly different.

The roster grows to 289 species, including new evolutions, plus 46 regional variants (Alolan, Galarian and Hisuian forms) and 56 cosmetic forms such as Magikarp patterns and Pikachu with Fly or Surf — 391 unique Pokemon overall. Maps were revamped too: some areas return from Red, Blue and Yellow, some are rebuilt from HeartGold and SoulSilver, and others are original — the 3.2 notes mention places like Celadon University, Yellow Forest and Lucky Island. Characters like Lorelei, Agatha, Lyra and the Team Rocket executives join the cast.

Version 3.2.0 arrived on 13 October 2025 as a full start-to-finish release, and the hotfixes that followed ended at v3.2.3 on 12 December 2025. Each release ships a regular ROM, a faithful build that leaves out some non-canon changes, and a debug build.

• Physical/special split, Fairy type, abilities and natures on Game Boy Color
• 289 species plus 46 regional variants and 56 cosmetic forms
• New Game setup to toggle natures and abilities and choose the EV system (no limit, 510 cap or off)
• 73 new moves, 75 unlimited-use TMs and 31 move tutors
• Redesigned PC storage with box switching and party management
• HGSS-inspired Pokedex with base stats, egg groups and encounter maps
• 60fps overworld and visible rain, snow and sandstorms
• Revamped and new maps from RBY, HGSS and original designs
• Running shoes, continuous Repel and an optional no-exp mode
• Post-game Gym Leader rematches and a new event after beating Red

Polished Crystal is not a punishing hack, but it is clearly harder than the original. The level curve was redone so the challenge rises steadily instead of plateauing in the middle of Johto, and trainers use newer Pokemon with sensible movesets. Players on r/PokemonROMhacks often describe the curve as raised but well balanced.

It suits players who love Gen 2's atmosphere and want it to play like a modern game. If your main goal is an open map and choosing your own route, Crystal Clear is the better match; if you want a brutal challenge, look at a difficulty hack instead.

• Download only from the official GitHub releases page and pick the regular or the faithful build before you start.
• Look through the New Game options carefully — natures, abilities and the EV system are set there.
• Avoid save states as your main way of saving: the new box system can be corrupted by some emulators, especially with save states.
• Do not use PKHeX or vanilla Crystal cheat codes; the data structure is different and can break your save. The developers recommend their own save editor.
• Keep PolishedDex (polisheddex.app) open on your phone — it lists locations, learnsets and events for the current version.

The 3.2 series reworked the summary screen with a dedicated egg page, added Pokedex and Pokegear icons, reintroduced trade evolutions, made modern EV rules the default and added an optional no-exp mode and new move tutors.

The following hotfixes were small but important: 3.2.1 temporarily disabled trading Pokemon that hold mail, 3.2.2 changed the link version and added a new Marowak sprite, and 3.2.3 fixed a crash when Flare Blitz is called by Metronome or Sleep Talk. Saves from 3.2.0 onward need no patching; saves from 3.0.0-beta through 3.1.1 can be upgraded with the Polished Save Patcher.