If you are asking where do you find Mr.Briney after you help him in the Rusturf Tunnel, then he will be back in his house on Route 104. He offers boat rides to Dewford Town and Slateport City until you gain the Balance Badge from your Gym Leader father. He will be in the last location where you left him if you take a ride from him, and will not be in his house. For example, you take a ride to Slateport, and you somehow manage to get back to Route 104 without taking a ride from Mr. Briney. He will not be in his house but rather in Slateport City's beach, waiting where you left him.
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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.