You can; they're just a bit more rare than the male ones. The first you find in Celadon city is most likely to be male, but you can save just before picking it up and do the process under you get a female one. If you, breed a male Eevee with a Ditto and your egg has a chance of being a female one.
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you can't...i tried this with my eevee it doesn't work. you can get it and trade it from the colosseum Trade
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
Eevee does not appear in the wild naturally in Pokemon Sapphire. In order to get one, you have to trade it from either FireRed or LeafGreen, where you can get one in Celadon Mansion, or from Pokemon XD, where you start with one.
you can get the leaf stone, fire stone, and thunder stone at the big department store in celadon city. you get eevee in the back on the Pokemon mansion.
Poliwhirl → Poliwrath, Shellder → Cloyster, Staryu → Starmie and Eevee → Vaporeon