Eevee evolve when it is level 24. If you want it to evolve into, for example, you want a Vaporeon, you have to give it a Water stone, Jolteon you need a Thunder Stone, and Flareon you need a Fire Stone. Eevee can also evolve in specific time of day, for example, if you want an Espeon, you need it to have high friendship during the daytime, including morning. If you want an Umbreon, you need it to have high friendship during the nighttime. And Eevee also can evolve near 2 diffrent kind of rocks, for example, if you want a Leafeon, you need it to evolve near a Moss Rock, if you want Glaceon, you need it to evolve near a Ice Rock. I have a Glaceon myself, and I just got Glaceon. The Ice Rock is on Route 217 headed to Snowpoint City, and the Moss Rock is in Eterna Forest. Hopefully this information will help get the evolve forms of Eevee you want!
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Eevee doesn't have a set level to evolve into Umbreon. All you have to do to evolve it is max out its happiness at night. ~KKMG1
Jolteon does not evolve, but to get a Jolteon you need a thunderstone to evolve an Eevee into Jolteon.
Take your Eevee to the Eterna Forest and level it up next to the moss rock.
you have to level him up at night
Vaporeon - Evolve using Water Stone Jolteon - Evolve using a ThunderStone Flareon - Evolve using a Fire Stone Espeon - Evolve by happiness between 4am and 7:59pm Umbreon - Evolve by happiness between 8pm and 3:59pm Leafeon - Trade Eevee to Pokemon Pearl, Diamond, or Platinum, and level it up in Eterna forest. Glaceon - Trade Eevee to Pokemon Pearl, Diamond, or Platinum, and level it up on Route 217.