Watch Pokémon the Movie: Genesect and the Legend Awakened

Mewtwo while flying with a group of flying type Pokemon see's a group of Genesect getting swept up by an avalanche and struggles to save them. One of them however a red Genesect is swept away and is unable to be saved. Mewtwo learns the Genesects have been ressurected from fossils by team plasma but escaped now they are trying to go back to their home while everyone thinks they are enemies. The red Genesect comes back and attacks Mewtwo thinking that he is trying to threaten the other Genesect.