The story is set in Okoya Forest, a Pokémon paradise protected by strict rules that forbid outsiders from setting foot inside. The film centers on Coco, a boy who was raised by Pokémon and also considers himself as one, treating the Mythical Pokémon Zarude as his father. Ash and Pikachu encounter Coco during an adventure. The film focuses on the theme of a "human raised by Pokémon," instead of the previous films' focus of the "bond between a human trainer and their Pokémon." 
 
(Source: Anime News Network)

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)

Pokémon Trainer Satoshi has a new plan: see the world! But first, he and his partner Pikachu are headed to the opening of the Sakuragi Institute, a research facility dedicated to uncovering the mysteries of Pokémon in every region. Satoshi meets Gou, another boy with boundless curiosity about Pokémon, and both are overjoyed when Professor Sakuragi asks them to become official research fellows. With Satoshi as determined as ever to become a Pokémon Master, and Gou aiming to catch one of every Pokémon (including the Mythical Mew), our heroes are in for adventure and excitement as they explore the wide world of Pokémon!
 
(Source: Pokémon TV)
 
Note: Episode 119, 121, 126 and 128 are recap episodes that did not air outside of Japan.

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