Up your friendship with Eevee, then level it up during the day.
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In Pokemon soul silver you get eevee from goldenrod city, go to bills house talk to him (after you've met him in Ecruteak) and he will give you a eevee, level it up with max happiness during the day and it will evolve into espeon.
Evolve it from eevee
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
if i get eevee in level 20 what level eevee need to evolve into espeon
You can't. It evolves by the time of day. Since there isn't a clock, eevee won't evolve into espeon OR umbreon.