Pokémon Prism (GBC) – Multi-Region Adventure with 253 Pokémon, New Types & Playable Pokémon Segments
Game Information
Table Of Contents
About This ROM Hack
Pokémon Prism is a large-scale ROM hack originally created by Koolboyman and later continued by the RainbowDevs.
Set primarily in the brand-new Naljo region, Prism significantly expands the Generation II engine with new types, abilities, mechanics, regions, and side activities. It is widely considered one of the most ambitious GBC ROM hacks ever created, both in scope and technical depth.
The project famously received a cease & desist from Nintendo in December 2016, halting its original development. A leaked build (v0.91) surfaced shortly after. Since then, RainbowDevs have continued refining and expanding the hack, leading to the current 0.95 release line.
Story Overview
You play as Prism, the child of a famous Pokémon Trainer. After a landslide leaves you stranded in an unfamiliar land, you awaken in the industrial region of Naljo — a region driven by rapid development and questionable leadership.
After rescuing a lost Larvitar, you begin a journey that spans multiple regions. Along the way, you must collect 20 Gym Badges, uncover corruption, confront powerful forces shaping Naljo’s future, and restore balance to a fractured world.
The adventure eventually extends beyond Naljo, allowing travel to Rijon, Johto, Kanto, and Tunod — making this one of the most region-rich hacks on the GBC engine.
Key Features
- Expansive Multi-Region Adventure: Explore up to six regions, including the brand-new Naljo (larger than Johto), plus Rijon, Johto, Kanto, and Tunod from Pokémon Glazed. Naljo alone features 10 original cities, extensive routes, caves, forests, and hidden secrets.
- 253 Pokémon Across Generations: Catch Pokémon from Generations 1–4, including Sylveon, along with original Fakemon legendaries.
- Play as Your Pokémon: Take direct control of your team members in special Pokémon-only areas to solve puzzles and access locations humans cannot reach.
- Trainer Customization: Choose from 12 trainer options (6 male, 6 female) with customizable color palettes.
- 20 Badges to Earn: Challenge new Gym Leaders and Trainers across multiple regions.
- Three New Types: Gas, Sound, and Fairy are integrated into the Generation II battle system.
- Abilities System: Fully implemented abilities within the GBC engine.
- New Moves & Items: Expanded movepool, new items, and updated TM/HM sets.
- Naljo Pokédex: A completely reorganized regional Pokédex tailored to the new region.
- Reworked Clock System: No longer tied to real-time; tracks in-game days, months, and years.
- Trainer Abilities & Crafting: Mine, smelt, craft, and interact with the environment — including jumping chasms and exploring underground areas.
- Hidden Gold Tokens: Collect 100 hidden tokens throughout the world for special rewards.
- Side-Scrolling Sections: Unique gameplay areas rarely seen in Game Boy Color Pokémon hacks.
- Visual Enhancements: Updated sprites and animations for Pokémon from later generations.
- Unique Storytelling: A character-driven journey centered on legacy, industrial expansion, and restoring balance to Naljo.
Known Bugs & Issues
- Version 0.95 addresses most known issues from the leak and restores missing content. Minor bugs may still exist due to the complexity of the project.
Screenshots
Download Links
Documentation
Detailed Walkthrough by Olivia R.
Developer Information
Developer / Team: Koolboyman, RainbowDevs
Credits:
- Hiroshi Sotomura – Website & ideas
- Cat333Pokemon – Music
- Gronnoc – Music
- LevusBevus – Music
- OrthodoxTrainer – Maps & graphics
- MeanMrMustard – ASM help
- Tauwasser – Scripting documentation
- BurstX – Pokémon overworld sprites
- Multiple testers and contributors
Source & References
Official Thread / Website: RainbowDevs
Community Link: https://discord.gg/PewQHvy
Frequently Asked Questions
Q: How many regions are playable in Pokémon Prism?
A: Naljo is the main region, and you can also travel to Rijon, Johto, Kanto, and Tunod, making it one of the most region-heavy GBC hacks available.
Q: How many Pokémon are in the Pokédex?
A: 253 Pokémon from Generations 1–4 are included, along with Sylveon and some original legendary Fakemon.
Q: Does Pokémon Prism include new types?
A: Yes. Gas, Sound, and Fairy types are added to the Generation II battle system.
Q: Are abilities implemented in this hack?
A: Yes. Pokémon abilities are fully integrated, which is a significant expansion over the original Pokémon Crystal engine.
Q: Can you really play as your Pokémon?
A: Yes. Certain areas allow you to directly control your Pokémon to solve puzzles and progress.
Q: How many Gym Badges are there?
A: There are up to 20 badges across multiple regions.
Q: Who is this hack for?
A: Pokémon Prism is ideal for players who want a large-scale, content-heavy GBC Pokémon experience with multiple regions, expanded mechanics, deeper systems, and a longer overall adventure.
Q: Is the current version stable?
A: Version 0.95.0254 fixes most issues from the earlier leaked build and is the most complete and stable public version.
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