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.
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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
You can't. Unless you have gamesharks code or and action replay then your out of luck
fire stone = flareon water stone = vaporeon thunder stone = jolteon (For fire red & leaf green) sun stone = espeon moon stone = umbreon have fun :D
you cant umbreon doesn't exist in fire red
it can't in fire red leaf/ruby saf and emerald but i don't know if it can learn it in plat