Answer Trade from PKMN Colloseum.
AnswerYou have to make the eevee really happy with you by giving it vitimans, walking with it, and battling with it and then at night time, raise it a lvlif you want espeon do the same thing but at day time(3:49-8:00 is umbreon everything else is espeon
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Umbreon is a Dark type pokemon.
Trade it to ruby,sapphire or emerald have them evolve your evee at night then give it back to leafgreen.
well, umbreon can be a boy or girl. but in Pokemon rescues if you're an eevee and evolve into umbreon then it depends on your gender. in the Pokemon pearl and diamond there r mostly boys, well in my game.
You cannot get an umbreon on Pokemon Yellow as they were only introduced in Pokemon Silver and Gold and from then on. You can only get Vaporeon, Jolteon, and Flareon on Yellow.
Well, you can't get an Umbreon on Pokémon Leaf Green... since it doesn't have a clock (Umbreon evolves at night time). So the only way is to trade it to Ruby/Sapphire/Emerald. There, you raise it to max friendship and make sure the clock is on night time. Raise it a level, and your Eevee will evolve into Umbreon. But this is only if you can trade...so, it's actually impossible if you can't trade.