Eevee is a Pokemon belonging to Izzy, nicknamed Evol. Izzy obtained Evol prior to Not Always..... In that episode, Izzy used him against Ash's Bayleef, but ended up losing. In Chika, after Izzy finds a Fire Stone and tries to eat it, Evol grabs it from her and evolves into Flareon.

Evol the Flareon

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