Pocket Monsters: Coco - Mou Hitotsu no Hajimari

The story of another beginning that leads to the story of *Pocket Monsters: Coco*.

The forest of Okoya, a wild land that spreads around a giant sacred tree. A variety of Pokémon live there peacefully, and a phantom Pokémon, the masters of the forest, swarms in the depths. That Pokémon's name was Zarude. One day, one of the stubborn Zarude living in the flock happened to find a human child in the forest. The Zarude's rule is that it cannot live with humans, but the Zarude breaks the rule and decides to live with the human. A touching story about the unusual bond between humans and Pokémon begins now!

(Source: Shogakukan, translated)