This Espeon is a psychic-type Pokémon owned by Virgil.
Espeon was first seen when it saved Ash Ketchum and Iris from falling into a cliff by using Psychic. The heroes came to Virgil's house, where Virgil sent his Pokémon, including Espeon, who was a part of his team. Espeon used Psychic to save Pikachu, Oshawott, Scraggy, Axew and Emolga after they were sent flying off a cliff by a wild Garbodor.
Espeon was seen during Virgil's Vertress Conference battle against Cameron. However, Espeon wasn't seen doing anything on-screen, as it was quickly replaced by Flareon. Espeon was also used off-screen in Virgil's battle against Dino in the final.