Learn how to evolve your Eevee into Espeon in Pokémon Go! This guide covers the buddy system, walking distance, and a simple trick to guarantee an Espeon evolution. Ensure your Eevee is set as your buddy, walk 10km, and then evolve it during the day to get your Espeon. If you’ve evolved an Espeon before, you can use the “name trick” again for a guaranteed evolution.