From Bulbapedia, the community-driven Pokémon encyclopedia.
Evian (Japanese: コロク Koroku) is a character of the day in From Cradle to Save.
He is a student of Angela's in a Pokémon Ninja School deep in the forest. After being assigned to keep an eye on Ash and his friends, he later takes them to the school, seeing they aren't the thieves that he was looking for.
As part of the ninja training, Evian and Ash were assigned to find and capture Angela's Kecleon, which he almost does. He later helps in defeating Team Rocket, as they were the thieves who were stealing from them.
This listing is of Evian's Pokémon in the Pokémon anime.