A peaceful park amid the hustle and bustle seems like the perfect new home for a group of Mythical Pokémon: four Genesect and their red leader. These new neighbors quickly become a problem for the cities residents, though they don't trust people, and they've found a dangerous ally in the Legendary Pokémon Mewtwo, whose origins also involve human tampering. But the red Genesect doesn't want Mewtwos help, and their confrontation quickly rages out of control! Can Ash and friends stop these two powerful Pokémon before they destroy the city?