Pokemon The Movie 04: Celebi: Voice of the Forest

The movie follows Sammy, a young boy who saved a Celebi 40 years ago from a Pokémon Hunter. Using Celebi's time-traveling power, they were transported 40 years into the future. They meet Ash, Misty, and Brock, who help Sammy take Celebi to a healing lake in the forest to recover from its wounds. However, they're pursued by Team Rocket's Iron Masked Marauder, Vicious, and Jessie, James, and Meowth, who all want to capture Celebi.