Question: what stone do you use to evolve eevee into umbreon in pokemon sword?
Answer: Umbreon is a Dark-type Eevee evolution, introduced in Pokemon Gold and Silver. Evolve Eevee into Umbreon also by raising its Friendship to three hearts, except this time, make sure it levels up during the night time. If you take it to the friendship checker in Hammerlocke, he will say "You two get along great!