Not possible, It's not even in the pokedex...
you could cheat or trade
No, it isn't possible to find Eevee in Sapphire. You'll have to trade one from FireRed/LeafGreen.
you get it on mt pyre.
you cant you have to trade from leafgreen or firered
Eevee can be found on Route 116 after you obtain the National Dex. (DexNav exclusive)
You can only get it from trade; there is no location for it to appear in Ruby and Sapphire.
No you cannot get eevee in emerald, but you can get it in sapphire.
Eevee is not available in Pokémon Sapphire. Eevee is available in Pokémon FireRed and LeafGreen and you may be able to trade it from LeafGreen or FireRed to Sapphire.
other games
other games
You can find Eevee on route 116. You have to use the DexNav before you can encounter it. It's rarity is uncommon and it will have level 8.
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 have to trade from firered, leagreen, diamond, pearl, or platinum.