A vast Pokémon habitat amid the hustle and bustle of the big city seems like the perfect new home for a group of five Genesect. The arrival of these Mythical Pokémon quickly becomes a problem, though: their nest threatens the city s power supply, and they keep attacking those who approach it. The arrival of the Legendary Pokémon Mewtwo who sympathizes due to its own origins only makes things worse, and the confrontation quickly rages out of control! Can Ash and friends stop these two powerful Pokémon before they destroy the city?