You can't. you can only get eevee once on Pokemon red.
yes
In celadon manison.
You'll have to trade an Eevee from Fire Red, Leaf Green, or XD.
You can't find Eevee in Pokemon Ruby, but you can trade for it from Fire Red, Leaf Green, and XD.
Trade
yes
No only Fire Red and Leaf Green and trade it from Pokemon fire red and leaf green
You have to trade it from Fire Red or Leaf Green.
No, however, you can with an AR.
Trade with other games!
eevee and pikachu.
skitty, eevee, and(maybe) chikorita