To evolve Eevee into Espeon, you need to raise it's happiness to MAX. Then, in the daytime raise one level and, POOF here is your Espeon!
You need to make your eevee happy by giving it haircuts/massages etc. The best method is to give it a sooth bell to hold and train it up.
when it is happy enough you level it up and it will evolve.
WARNING!
Eevee will evolve into Espeon in the daytime and Umbreon at night time
IN SHORT MAKE EEVEE HAPPY AT DAYTIME!
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If you treat it well and only level it up at day time and its the same with umbreon but level it up only at night
if i get eevee in level 20 what level eevee need to evolve into espeon
Evolve it from eevee
You can't make eevee evolve into espeon by leveling it up. You have to give it a certain stone. I think it might be a moonstone, but maybe that makes eevee evolve into umbreon.
in the morning, after 8:00, you evolve eevee into espeon, at night, after 8:00, it evoles into umbreon (make sure eevee likes you alot)
There is no stone needed to evolve (although i think it should evolve with sun stone) .But your friendship with the eevee has to be very good then and only then will it evolve into an espeon