level it up at night with high friendship .To help give it a massage (vielstone city) put it at the front of your party or give it a friendship increasing item . hope this helped
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Train your Eevee at night and with happiness. It will eventually evolve into Umbreon.
Eevee doesn't evolve into Umbreon with a stone. Eevee evolves into Umbreon when it is levelled up with high happiness during the night.
Eevee's Dark-type evolution form is named Umbreon. In the primary core games, Eevee evolves into Umbreon when it has full Happiness during the night.
Make Eevee as happy as you can. For Umbreon, level it up at night. For Espeon, level Eevee up in the day.
To make Eevee evolve into an Umbreon, you have to level it up with high happiness at night.