Talk to a bold guy at the ship building house (Don't know what else to call it) its at the south-east side of the city and is made of wood. He will ask you to see Capt. Stern and then they will move. If you want the TM thief you should talk to one of the first team Magma members you see inside the museum.
To bad.... I have that problem too....
If you are talking about entering the museum in Slateport, just talk to a guy in the big wooden house at the south-east end of Slateport. After that, they have moved :P
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.
To get to Mount Chimney, you have to go to Slateport, go into the water museum, defeat Team Aqua, go to Fallarbor town, defeat team Magma and get the magma emblem, go back to the cable car and go up.
Dock is located at the Shipyard in Slateport City. You must talk to him in order for the Team Aqua/Magma grunts to move, allowing you access into the Oceanic Museum.
In Slateport City, you'll have to go to a museum in order to finish an errand. Talk to one of the Team Magma members there, and he'll give you the TM Thief.
Go to the museum in Slateport. Talk to the grunts, one of them will give you a TM. Then go upstairs and talk to Capt. Stern. Two grunts will come. Fight them. Then Archie/Maxie will come and make bold claims. Your path will be cleared.
I believe you go to slateport, and talk to Prof....no the dude at the museum that's being interviewed (he's infront of the port) you can then go to the Aqua hideout
First talk to both of them. then go to slateport. go to the slateport harborand then interesting things will happen then the guards will be gone.
by Daniel Le: go to Slateport city the go to stern's ship yard ask the man at the front table. after that go to oceanic museum then go upstairs ask the man behind the computer then you battle team magma. and you can go to mauvile city
I had trouble with this too. You need to get the magma emblem from Mt. Pyre, then go to Mt. Chimney down the side, and a hole will open up. This is team magma's base. Infiltrate it then go back and the wailmer will be gone. Hope that helped!
A team aqua grunt gives it to you in the slateport museum after you defeat them all.