Question: what do you need to evolve eevee into umbreon?
Answer: To get Umbreon or Espeon, you need to raise your Buddy Pokémon's Friendship level: Make the Eevee you want to evolve your Buddy. Walk with your Eevee Buddy for at least 10 KM and until you get two at least Eevee candy. (You need to have gotten two candy for this to work.)