Catch the submarine Pokémon and beat the crap out of the Elite Four.
he goes to his underwater hideout cave.
In Pokemon Sapphire, Latios can be found in Southern Island.
If you're talking about Professor Oak, he's not in Pokemon Sapphire.
in the water maybe
The submarine belongs to that scientist guy, you're not allowed on, you have to learn dive then find the place they are exploring, but there is a scale model of the sub in the museum.
Go back to Slateport town. Inside the ferry building, you will find captain stern and the submarine being robbed by Team Aqua.
The Move Deleter in Pokemon Ruby, Sapphire, and Emerald is found in Lilycove City.
In Pokemon Sapphire, Shuppet, Duskull, Vulpix and Chimecho can all be found on Mount Pyre.
Nosepass is a rare Pokemon in the game Pokemon Sapphire. It can only be found by using Rock Smash on boulders in Granite Cave.
Look on serebii.com in the dpthgss pokedex.
Eh... I'am 100% sure you won't get to catch draganaor in Pokemon sapphire but of cause you can trade it.
Groudon cannot be found in Sapphire. Hence, it has to be traded from Ruby.