After being assigned to keep an eye on Ash and his friends, he later took them to the school, seeing they weren'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 did. He later helped defeat Team Rocket, as they were the actual thieves who were stealing from them.
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Ninjask is Evian's only known Pokémon. It was used to search for Angela's Kecleon after she assigned the group to search for it. Later, it was captured by Team Rocket, but later freed by Ash's Grovyle.