How do you evolve Eevee into Espeon or Umbreon in Pokemon Gold or Silver?

Answer 1

you need to max out its happyness , if you do it at night it will be an Umbrion and if you do it at daytime it'll be an Espion

Answer

In other words, train it like you would any other Pokemon your trying to evolve

answeryou have to give your eevee haircuts! if you use the good one you get espion if you use the younger one you get umbrion also you have to train at night for umbrion and day for espion.

Answer:

i don't believe any of that for a sec first off umbreon is the night Pokemon and espeon is the day Pokemon if ur gonna try to give advice please do it right. i never gave my eevee's haircuts and i own all the evolutions (cloned 5 eevees) umbreon espeon flareon vaporeon and jolteon. granted flareon, jolteon and vaporeon u only need the stones to evolve them but umbreon and espeon were definetly harder but i own both. umbreon is my favorite though that's the one that travels with me in the game yes it evolved at night and the espeon during the day it took me forever to evolve them though i traveled with 2 eevee's in my team i trained them both day and night but i let one evolve during the day (espeon) and the other evolve at night (umbreon) and yes i agree train it like u would train any other Pokemon to evolve. the more u train it the happier it will become but haircuts i don't believe u need i never gave mine haircuts.

Actual Answer:

the previous answerer was close, but evolving eevee into an umbreon/espeon is determined by it's happiness, rather than it's level or anything else. you can understand happiness better by going to "http://www.gamefaqs.com/portable/ds/file/925601/48344" There are certain things which will raise the happiness of a Pokemon, like certain items (fresh water, lemonade, soda pop, moomoo milk, protein & other vitamins), winning battles, going to the people who groom your Pokemon (it does indeed raise your Pokemon's happiness) and by walking- every two hundred something steps, you get 1 happiness point. your Pokemon will only evolve when it levels up, even if you have enough happiness points (which usually starts of at 70 when you catch/trade for a Pokemon) and you have to get up to 220-250 happiness points. there's no way to tell how many happiness points your Pokemon has.

in generation 3, the Soothe bell (hold item) and Luxury ball (ball) increase the amount of happiness points you get when you do any of the other acts, and several berries raise happiness.

a guide to how many happiness points gained by each action is on http://bulbapedia.bulbagarden.net/wiki/Happiness

""there's no way to tell how many happiness points your Pokemon has.""

This isn't entirely true, there is a woman in a building in the top right of Goldenrod city, it's a bit north of the bike store. She looks at the Pokemon in the first position and you can gain an idea of it's happiness level from her response. You are looking for something along the lines of ''I get the feeling that it really trusts you"