Over the past year, Nintendo has sent out over 500 DMCA notices to one site alone, stopped the Metroid 2 fan remake and DMCA'd the Pokemon-inspired game 'Uranium.' The latest fan project to get the axe from Nintendo was Pokemon Prism, unfortunately for Nintendo, the game seems to have leaked out regardless.
Pokemon Prism was based on Pokemon Gold and used Game Boy Color-style graphics, but was planning to offer much more than just a ROM hack of Gold (which it was). According to creator Adam Vierra, Pokemon Prism was planned to feature a brand new story, over 200 Pokemon, new regions, fully customizable trainers, 60 FPS gameplay and even the ability to play as one of the Pokemon you've caught.
The game's files have begun circulating on the web thanks to a group of game pirates. These who claim to be “a group of people interested in seeing ROM hacks succeed,” have posted a README file on 4chan claiming to have no affiliation with the devs behind Pokémon Prism and managed to get the files from a dev that got "careless.”
As for the game's files, you can probably find it fairly quickly.
