Go back to Slateport town. Inside the ferry building, you will find captain stern and the submarine being robbed by Team Aqua.
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.
Catch the submarine Pokémon and beat the crap out of the Elite Four.
you will find team aqua in the under water cavern near the dive point in sootopolis
There is no Pokemon mansion in sapphire.
He is not in Pokemon: Sapphire. You will not be able to find him. He is in Pokemon: Diamond, Pokemon: Pearl, and Pokemon: Platinum. You will definitely have trouble finding him in Pokemon: Sapphire.
you can't find it in Pokemon sapphire, but you can find it in Pokemon ruby. Hope this helped. :-)
he goes to his underwater hideout cave.
Lucario isn't in Sapphire,Sapphire is a Hoenn pokemon,Lucario is a sinnoh pokemon.
there a dive area and once you dive there, there youll find the submarine but you really need to look. the entrabce is like entering a cave underwater
no you cant. you catch spheal in Pokemon sapphire and snorunt in Pokemon ruby.
I'm sorry but you can't find a diglett in Pokemon sapphire, you can only get it by trading
it is in team aqua's base (the one where they had the submarine)