After delivering the letter to Steven at his house go back to rustboro and speak to the ceo he will award you with a scanner
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there is no scanner on fire red/leaf green. Only on ruby, sapphire, emerald
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.