Walk in the door. But seriosly, go to the shipyard (baise building in east part of the city) & talk w/ Dock. He tells you to find some captin. Now you can get in. PS: Here's a tip. when you enter the museum, Team Aqua guys will be walking around, if you talk to one of them, he'll give you a TM
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You deliver Devon's Goods to Captain Stern who is in Slateport City's museum.
the third badge in sapphire is at mauville city(north of slateport city)
In Slateport City, the contest hall is close to the northern exit, just to the left of it.
North of Slateport city on route 110.
To get the harbor mail you need to go to slateport city