you must get it to like you and evolve it during the day
Evee will never evolve to espeon or umbreon in firered because the game doesn't have internal time so to get an espeon or umbreon you must trade your evee to a game with a internal clock like ruby, sapphire and emerald. Also you can trade an espeon obtained from colosseum or even xd gale of darkness.
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.
trade eevee from leafgreen or firered.
Its not possible to get espeon in leafgreen or firered because there is no in game clock so trade evee to a game with a in game clock like ruby and sapphire then train it to become espeon. Optional other ways: If you have Pokemon colosseum or Pokemon xd gale of darkness you can trade an espeon from either game (in colosseum you begin with espeon and umbreon trade espeon to leafgreen and in xd gale of darkness in gateon port a sailor in the parts shop will allow you to get items to evolve your evee choose the dawn shard then train evee a few levels to have it become espeon then trade it to leafgreen remember both colosseum and xd gale of darkness and leafgreen must have be beaten and for leafgreen you need the national dex and the ruby and sapphire to receive the espeon from either game).
Evee can't be found on emerald so get one in firered or leafgreen then trade it to emerald.
No, you might be thinking of evee which you have to trade for firered or leafgreen
Espeon doesn't evolve with a stone. You need to level him up when his friendship is at it's highest and during the day. I can't recall, but I don't think LeafGreen and FireRed have the day/night function, so you'll need to trade your Eevee to Ruby, Sapphire or Emerald. Evolve him there then trade him back.
No but you start with two evee forms: Umbreon and Espeon.
You can get lucky train a evee so that its happiness is at the max with you it will hopefully evolve to espeon this is random though you may get umbreon so your going to have to get one from a trade.
Evee will evolve to espeon if it has max friendship with its trainer and if its morning.
Get an EVEE from Hearthome city where you meet Bebe yo have to have room for it with you to get it from Bebe then just level it up until it wants to evolve to ESPEON so theres the answer but of course you can just trade with a friend.
You have to trade you eevee into another Pokemon game, and then raise it's happiness in that game to get it to evolve, then trade it back...kind of annoying