You should go to the top of the Mt.Pyre first (outer part). you will meet Archie, then after some talking, you get a Magma Emblem (This is a very important item of the storyline). Then you should fly to Slateport City. You should ran into a crowd around the shipyard, talk to the scientist next to the reporter. Then after some talking and story, the submarine is stolen. Then you go back to the beach of Lilycove, then move north into the Team Aqua Base. After you get rid of the Team Aqua member guarding the Submarine, Archie ran away with the Submarine. Then you get out of the base, your path to Mossdeep should be cleared now.
p/s: Explore the base before looking for the submarine and you with find a Master Ball in a room with 1 nugget and 2 Electrode.
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You must defeat Team Aqua in their Lilycove City base (right next to the Wailmers). To gain entrance to the base, you must first go to Mt. Pyre and climb to the summit.
You can't chase away them away, ya have to blow out the secret hideout and poof! Off they go!
first you have to battle maxie at the magma hideout (jagged pass) then go to slateport and watch aqua steal sub. Go to the aqua hideout (near the wailmers) and watch them run off with submarine. (dont forget to get master ball from hideout) now the wailmers are gone
you can't
surf to mount pyre then beat team aqua/magma then you can surf to team aquas hideout from lylicove after that the wailmers wil move and you can surf to modsep