Pokémon 4: El regreso de Mewtwo was released in the year 2002。Pokémon 4: El regreso de Mewtwo is also called as Pokémon 4Ever, Pokemon 4ever, Pokemon 4Ever: Celebi - Voice of the Forest, Pokémon 4ever - matka aikojen halki, Pokémon 4: The Movie, Pokémon 4: Pour toujours。

In this film, we meet the new Pokémon, Celebi, who has the power to travel through time. Vicious, the future descendant of James and Jessie of Team Rocket, travels back in time to wreak havoc, and it's up to young Ash, Pikachu and friends to stop him. Along the way, Ash continues to mature into the unstoppable Pokémon trainer he will become in the future.