In this new animated adventure, a troop of the Mythical Pokmon Zarude live deep within the Forest of Okoya, where they maintain a strict rule that forbids outsiders from entering their territory. Elsewhere in the jungle lives Koko, a human boy raised by a lone Zarude who left the troop.

Koko has grown up never doubting that he is a Zarude, but one day, a chance meeting with Ash and Pikachu leaves Koko with his first human friend. Is Koko truly a Pokmon? Or is he, in fact, a human? When danger threatens the jungle, the bonds between Pokmon and humansand the love between parent and childwill be put to the test.