Pokémon the Movie: Secrets of the Jungle

In the Forest of Okoya, a feral child named Koko has been raised as a Pokémon by the Mythical Pokémon Zarude after being found as an infant. When Ash Ketchum and Pikachu visit, they help Koko protect the Great Tree from the sinister Dr. Zed, who will stop at nothing to exploit its healing properties. As Koko's true identity is revealed, he discovers his connection to the jungle and the mythical Pokémon that call it home, ultimately becoming a bridge between humans and Pokémon.