Unfortunately, there are no Joto Pokemon in Ruby or Saphire. However after beating the elite four, they are available on Emerald, Fire Red, and Leaf Green.
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at the middle border between kanto and joto
In the game Pokemon ruby destiny
no where
You can't find Eevee in Pokemon Ruby, but you can trade for it from Fire Red, Leaf Green, and XD.
You don't. You have to trade an eevee to Pokemon Ruby to use one in the game.