Pokémon Mystery Dungeon: Gates to Infinity is a oNA (web) anime, produced by OLM.

About the production: the story comes from a video game, there are 2 episodes of about 3 minutes and its current status is "finished".

Its main genres are adventure and fantasy, with themes such as Isekai.

On AniList, Pokémon Mystery Dungeon: Gates to Infinity has an average score of 58%, an average score, and appears on 1,232 users' lists.

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)

Official synopsis from AniList.