Mauville City
Hoenn · Sapphire
An X Speed lies on the ground at the city's south end, 5 tiles south and 4 west of the first house's entrance.
Rydel in the Bike Shop gives you the Acro Bike when you choose it; he stands 3 tiles north and 1 east of the door.
Rydel stands 3 tiles north and 1 east of the Bike Shop door and trades the Acro Bike for your Mach Bike whenever you ask.
Once you beat Norman at the Petalburg Gym, Wattson, 5 tiles north and 3 west of the first house's door, gives the New Mauville Basement Key.
In the second house, the Coin Case Trader 3 tiles straight north of the door trades you the Coin Case for a Harbor Mail.
In the first house, the Rock Smash HM Man gives you HM06 Rock Smash; he stands 3 tiles straight north of the door.
Rydel in the Bike Shop gives you the Mach Bike when you choose it; he stands 3 tiles north and 1 east of the door.
Rydel will swap your Acro Bike back for the Mach Bike whenever you ask; he stands 3 tiles north and 1 east of the Bike Shop door.
Wattson gives you TM24 once New Mauville is dealt with; he stands in the city, 5 tiles north and 3 west of the first house's door.