To get the Black Belt item in Pokémon Ruby you need to beat a trainer called Black Belt Nob five times on Route 115. To get rematches with him you need the Trainer's Eyes function of the PokeNav, which will only work after you've gotten 5 badges. If you walk into and out of the Route enough times, he should eventually call your character to ask for a rematch. After beating him five times he should give you the Black Belt item.
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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.
Yes, you can find Shroomish in Pokemon Ruby. They would be somewhere in Littleroot I think... If you find one, just look at pokédex where you can find them.