Umbreon doesn't have a stone. You have to max out Eevee's happiness and level it up at night.
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Eevee doesn't evolve into Umbreon with a stone. Eevee evolves into Umbreon when it is levelled up with high happiness during the night.
umbreon
no,it evolves if you've bonded with it well and level it up at night. Actually in Emerald 386 for GBA emulators it can.... Moon Stone ----> Umbreon Sun Stone ----> Espeon ;)
You can evolve it any time, and I mean ANY TIME as long as you have the stone for it... Fire Stone= Flareon Water Stone= Vaporeon Thunder Stone= Jolteon Moon Stone= Umbreon Sun Stone= Espeon I believe that's correct, but I'm not certain on the Umbreon/Espeon deal but yeah.
fire stone = flareon water stone = vaporeon thunder stone = jolteon (For fire red & leaf green) sun stone = espeon moon stone = umbreon have fun :D