A peaceful park amid the hustle and bustle seems like the perfect new home for a group of Mythical Pokémon: four Genosect and their red leader. These new neighbours quickly become a problem for the city's 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 Genosect doesn't want Mewtwo's help, and their confrontation quickly rages out of control! Can Satoshi and friends stop these two powerful Pokémon before they destroy the city?

Source: Amazon (edited)

AniDB | ANN | IMDB | MAL | TVDB | Wiki (en)

Parent story: Pocket Monsters: Best Wishes! Season 2
Other: Pikachu to Eievui Friends
Prequel: Mewtwo: Kakusei e no Prologue