To get an Espeon level Eevee with high happiness during the day(10:00 AM to 5:59 PM). Having Eevee first in your party while it holds a soothe bell, feeding it many rare candies, and battling with it often are all ways to increase its happiness. Though you have to be careful if it levels at night with high happiness it will evolve into Umbreon.
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Evolve it from eevee
Ive hear my friends say that in Pokemon yellow you can evolve eevee in a espeon with a moon stone
You can't. It evolves by the time of day. Since there isn't a clock, eevee won't evolve into espeon OR umbreon.
give it a thunderstone
You will get an eevee egg. That you can evolve into an eevee or the other eevee evolutions.