How to Get Espeon in Pokémon GO is easy if you know the trick. Here's how to make sure your Eevee evolves into Espeon in Pokémon GO.
Espeon is the Psychic evolution of Eevee. Normally, Eevee will randomly evolve into one of its three original evolutions: Flareon, Vaporeon and Jolteon. For Espeon and Umbreon, there are two ways of reliably getting the one you want.
How to Get Espeon in Pokémon GO
The first way is the naming trick. If you give your Eevee and specific nickname and evolve it, it will turn into the form that name corresponds with. This only works once per evolution. Espeon's nickname is Sakura.
The second way can be repeated as many times as you need. Make Eevee your buddy and walk 10 km, gathering two candy in the process. Evolve Eevee, still as your buddy, during the day for Espeon. You can do the same thing at night to get Umbreon. All of Eevee's evolved forms need 25 Candy to evolve.
Espeon itself learns a variety of Psychic moves, which makes it a good Fighting type counter in Raids. Unfortunately, it's outclassed by most other Psychic type Pokémon in competitive play. The only thing Espeon really has going for it is that it's fairly easy to get compared to the likes of Mewtwo or even Alakazam. It's not a bad Pokémon by any means, but once you've caught a stronger Psychic type you'll be replacing Umbreon first.