Evolve Eevee in the morning with high friendship. Try using the soothe bell. it makes a Pokemon really friendly in a short time.
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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