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.