go to cerulean city and go behind the Pokemon mansion and enter through the back, go all the way to the roof and go into the only room and on the table will be a pokeball with a lvl 25 eevee!
Eh-hem. It's CELADON city not cerculen
and its the celadon mansion not the Pokemon mansion
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You can't find Eevee in Pokemon Ruby, but you can trade for it from Fire Red, Leaf Green, and XD.
You have to trade it from ruby or use an action replay
you cant evolve eevee with a moon stone
Nope.
just trading ------ Oddish is a Fire Red exclusive Pokemon. You need to trade to get it.