For Mewtwo, the basis was Mew. For Shadow, the basis was not, actually, Sonic — at least not in universe. The legendary Pokémon and the moody 'edgehog are both synthetic beings, made in labs by ...

When a group of scientists are offered funding into genetic research if they agree to try and clone the greatest ever Pokémon, Mew, the end result is success and Mewtwo is born. However Mewtwo is ...