You simply need to have high friendship with Eevee and it will evolve into Umbreon at nighttime, just like Espeon. You can also find Umbreon in the middle of two caves between Medali and Tagree ...

It is no surprise that Eevee evolutions are one of the first things that Pokemon GO players check out when they start their journey. The cute Gen I Pokemon has a staggering number of evolutions ...

the top attackers from Eevee's branches of evolution are Espeon, Flareon, and Glaceon, with Espeon having a considerate edge of about 15 stat points. Umbreon clearly edges out in defense ...