You need to make Eevee love you, and then you evolve it at night.
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eh! i want Umbreon somebody please answer! You must have an evee that has max friendship with its trainer evolve during the nighttime so this means you can only get umbreon in ruby, sapphire, emerald, diamond, pear, platinum, heartgold, soulsilver and the original gold, silver and crystal.
Evee evolves 7 different ways (diamond/pearl for the other 2) so i while mention 5, Evee must be friendly to you and you must evolve it during the morning and it will become a espeon and at night umbreon, use a fire stone, water stone or thunder stone to get vaporeon, jolteon and flareon.
it depnds were u evolve it
level up evee at night with enough friendship
You buy Happiness in nighttime at the shop.