Coco is a young boy who was seperated from his parents at a very young age.
As a baby, he was found by a single Zarude living deep within the jungle, far away from any human settlement. Now an orphan, he was adopted by the Zarude and given the name Coco. Knowing that bringing in humans was against the rules of its troop, Zarude decided to leave the other Zarude behind so it could raise Coco safely. This Zarude, who took to wearing a torn piece of pink clothing, would become known as *Dada (Otou-chan)* to Coco.
Over the next ten years, Zarude raised Coco in the depths of the jungle, and the two developed a strong bond. As he has no memory of his human life, Koko believes he is also a Pokémon but is frustrated by the fact that he was seemingly unable to use moves. Zarude didn't want to tell Koko the truth of his origin, despite the troop leader informing that Zarude he was welcome to return to the group if he allowed Koko to leave the jungle.
(Source: Bulbapedia, edited)
