Pokémon Apocalypse

For too long humans have mistreated Pokémon. Until a mysterious Pokémon that had the ability to turn into any Pokémon got his hands on something that can turn humans into Pokémon. What are his goals? Can Red, Gold, Brendan and the rest stop him in time? Why are all of the legendary Pokémon vanishing? And does Ghetisis escaping from jail have anything to do with it?