No because the game lacks the built in game clock feature which lets the game change from day and nighttime which is essential for evee to evolve to Espeon or Umbreon. If you want these pokemon you will need to use Ruby, Sapphire or Emerald to evolve the Evee because these games have the in game clock feature or you can even trade the Espeon and Umbreon from pokemon colosseum.
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In ANY GAME!! If you use a moonstone, i think
evee evolves into: Flareon with Fire stone Vaporeon with water stone Jolteon with thunderstone Espeon with friendship Leafeon with somthing idk Unbreon and Glaceon
No, you cannot do so in LeafGreen. While Eevee can normally evolve into Espeon and Umbreon without stones, the lack of a time system in the game prevents Eevee from evolving into one of them.
so far, you cannot evolve eevee either to umbreon or espeon on FireRed because on FireRed and LeafGreen, there is no clock system. You must trade eevee to Emerald for evolving to Espeon or Umbreon
Evolve it from eevee