It can be 1 level it can be many depends on your evee's happiness.
Gain max friendship, and raise eevee one level at night.
just train them or use rare candies
you cant it is to eveolve eevee after u raise it up a level near it
The levels remain the same, you raise your Pokemon to those levels to evolve them.
In Pokemon Diamond, Pearl, and Platinum, you raise it till its happiness is really high enough and it has to be day. In FireRed and LeafGreen, you get the national dex raise it till happiness is high and it's daytime.....
you raise it up levels or if it needs stones you give it the right stone that it needs.
When Eevee is loyal to trainer. And when it is, and it levels up at night, You'll own an Umbreon!
they watch your Pokemon and raise its levels
To evolve Eevee into Espeon in Pokemon Emerald you need to raise it's happiness to max and level it up during daytime. To raise happiness you can keep the Eevee in your team for a while and fully healed up it should eventually reach max happiness to evolve in the daytime.
You need to raise its friendship not raise its level.
to get one you raise eevee to max happiness during the DAY.
they watch your Pokemon and raise its levels