After losing their ancient homeland, some surviving Genesect, led by a Shiny Genesect and aided by Mewtwo, seek refuge in New Tork City. Mistaking the urban landscape for their snowy mountains, they invade the city center, displacing other Pokémon and endangering the residents. An intense showdown between the Genesect leader and Mewtwo escalates, risking the city's destruction. Now, Satoshi and friends must intervene to prevent catastrophe and bring harmony to the battling Pokémon.