Pokémon the Movie: Secrets of the Jungle
劇場版ポケットモンスター ココ (original)
In the Forest of Okoya, Koko is a feral child who has been raised as a Pokémon by the Mythical Pokémon Zarude. Koko has grown up never doubting that he is a Pokémon even though he can't really use any sort of moves. Ash Ketchum and Pikachu meet Koko and help him protect the Great Tree from the crooked scientist Dr. Zed.
Starring Rica Matsumoto, Ikue Otani, Moka Kamishiraishi, Megumi Hayashibara, Shin-ichiro Miki, Inuko Inuyama, Kankuro Nakamura, Shoko Nakagawa, Koichi Yamadera
Watch "Pokémon the Movie: Secrets of the Jungle" on Netflix released in 2020. It's a action & adventure and animation movie, and has a rating of 6.4 out of 10 from Imdb which is usually fine for this kind of movie.