Eevee first appears in B2W2-064 while Lexi is in the Dream World. With no other Pokémon around, Eevee and Lexi join together as Lexi investigates the Dream World. After a run in with a mysterious Trainer and Pokémon, along with the events of M03 and M04, Eevee joined Lexi's team.
Eevee appeared regularly in New Beginnings, where it began to meet and interact with her other Pokémon. As of now, it has yet to appear again.
Eevee, like many of its species, is a usual normal happy and playful Pokémon that loves to interact with others. Eevee has a great will for battling and hopes to evolve, but struggles to decide which Eeveelution to evolve into.
While all Eevee's are able to evolve at anytime into eight known Eeveelutions, this Eeevee is special in that it can metamorphosis to and form different forms. Professor Magnolia suspects this is because it's actual destined evolution has not yet been realised.