Get Rock Smash in Mauville and head north!
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First beat the Mauville Gym leader, Wattson.
You have to talk to the 3rd gym leader after you beat your dad and he is in the middle on mavlle city.And he will give you the key!
first,talk to the gym leader at mauville(he will be out side the gym)then he will tell you about new mauville,then he will give you the basement key.second,you need to go to the river in front of the trick house and use surf and go forward.you will see a cave.go in and you are new mauville!
In Pokemon Sapphire when the player defeats Gym Leader Norman in Petalburg City, Wattson, the Gym Leader of Mauville City can be found at the intersection of Route 110 and Route 118. Upon talking to him, he will give the player the Basement Key to access New Mauville City.
After beating the 2nd gym leader you need to see steven in the cave in dewford town if you have not already if you already talked to steven then talk to mr briney and go to slateport city from here go north to mauville city and beat the 3rd gym leader there.