Umbreons don't evolve. To get an Umbreon you have to max your Eevee's happiness at NIGHT TIME (day time for Esporeon). You can raise its happiness by giving it a haircut in the Goldenrod underground passage, raising it a level, giving it vitamins (carbos, protein, etc.), not letting it faint and walking at least 256 steps. Go to the house above Goldenrod's Bike Shop or the old woman's house in Olivine to check your Eevee's happiness. If the lady in Goldenrod (not sure about the woman in Olivine) says "I get the feeling that it really trusts you", "It must love you a lot" or "It looks sort of happy" (Not sure about that one) then raise it a level and it should evolve.
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no it cannot it can only evolve into jolteon, vaporeon, and flareon. it is not until gold, silver, and crystal that you can get umbreon and espeon.
To get Umbreon in Pokemon Crystal, you need to evolve an Eevee into an Umbreon. Eevee evolves into Umbreon when it levels up with high friendship during the night or when leveled up with a Moon Shard. To increase friendship, you can keep Eevee in your party, use it in battles, give it vitamins, and avoid letting it faint. Make sure to level up Eevee during the night to evolve it into Umbreon.
You can only get the Shards in Pokemon XD. To evolve Espeon/Umbreon you must level them up during the daylight/night hours.
it depnds were u evolve it
Evolve it at 12 pm