Sorry, but the only way to obtain Eevee in Pokemon emerald, is to trade from Pokemon Fire read, or Leaf green. ;)
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There isn't an eevee in Pokemon Emerald. If you go to serebii.net you can find lots of other way to get eevee in the other games
No you cannot get eevee in emerald, but you can get it in sapphire.
To evolve Eevee into Espeon in Pokemon Emerald you need to raise it's happiness to max and level it up during daytime. To raise happiness you can keep the Eevee in your team for a while and fully healed up it should eventually reach max happiness to evolve in the daytime.
The Pokemon that evolve using a water stone: Eevee Starmie Lombre Poliwhirl, too...
Pikachu+Thunderstone=Raichu Eevee+Thunderstone=Jolteon These are the only 2 pokemon that evolve with the thunderstone in pokemon emerald