If it's the first time where you go into the museum you must go up the stairs and defeat the two thugs
Chat with our AI personalities
You have to talk to the scientist guy at the ship place in slateport city
Captain will be waiting in Slateport go back and talk to them him. Afterwards the Headquarters of Team Aqua/Magma will be open.
Right, The first time you have to go and talk to a man looking at some looking at some plans in the brown building with some cannoes outside in slateport and he will tell you ' Capt.Stern is out right now please can you dilever it to him personally' so go to the museum in slateport and the queue of people sould be gone. then go to the top floor (this costs $50) and talk to Capt.stern then two magma grunts will appear and you have to battle them. after that everthing past slateport should be clear from all magma grunts until you get to the next part of the storyline.
You need to go to slateport city fiery after that to mt.pyre (or first to mt.pyre and after that to the fiery in slateport) then go to team magma or aqua base (depends on the game) it is near lilicove beat everything there and the wailmers will be gone
Go In Stern's Shipyard At Slateport City And Talk To An Old Man Named Dock