Pokemon Fushigi no Dungeon: Magnagate to Mugendai Meikyuu
English title: Pokémon Mystery Dungeon: Gates to Infinity
Japanese title: ポケモン不思議のダンジョン マグナゲートと∞迷宮
Alternative titles: Pokémon Mystery Dungeon: Magnagate and the Infinite Labyrinth
Type: ONA
Source: Game
Episodes: 2
Status: Finished Airing
Aired: Nov 1, 2012
Duration: 2 min per ep
Rating: G - All Ages
Studios: OLM
Producers: Nintendo
Licensors: The Pokemon Company International
Genres: Adventure, Fantasy
Demographics: Kids

A boy awakens to the sound of someone crying for help. Looking around he notices he is on a body of water. Upon looking at his hands, he realizes he has been transformed into an Oshawott. He panics, and then finds himself plummeting toward then ground. He then wakes up again to find himself in a forest, with a female Pikachu leaning over him, asking if he's okay.

(Source: Bulbapedia)