Go to the pokemon center in Ecruteak City, Bill will come down stairs and talk to you. Then go to Goldenrod City to Bill's house and he will give you an Eevee. Get on your bike and ride around for 30 mins back and forth and fight some pokemon to gain a level, and if you ride around enough the happiness will grow and evolve. Better then fighting for hours trying to gain happiness.
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you need to get evee and give it love in the morning to get Espeon and at night to get Umbreon
Make Eevee as happy as you can. For Umbreon, level it up at night. For Espeon, level Eevee up in the day.
Yes it is possible to get Espeon and Umbreon in Pokémon FireRed but you cannot physically evolve Eevee into either Espeon or Umbreon in Pokémon FireRed due to there being no time cycle in the game so you will need to evolve Eevee into Umbreon or Espeon in Pokémon Ruby, Sapphire or Emerald and then trade it over to FireRed.
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 are eight. Vaporeon, Leafeon, Flareon, Jolteon, Umbreon, Espeon, Glaceon, and Sylveon