There was and are a couple of dead Pokemon Chaos Black torrents out there. Something at least similar to this existed as a ROM but I doubt it was ever ported to a playable cartridge.
Chaos Black is different and unrelated AFAIK. It's from the era when Pokemon games were named "[noun] [color]" rather than just "[color]" like this Black is supposed to be, and it is nothing like the game described in the post.
