The Hoenn Game Corner and Bike Shop are here. In addition, Wattson, the third Gym Leader of Hoenn, battles here.
Bike Shop- Here, you can talk to the owner and get either a Mach Bike or an Acro Bike. Also, if you want to switch bikes, you can talk to the owner again.
Mauville Gym- At the Mauville Gym, you have to get through the electric doors by defeating trainers. After you do that, you can fight Wattson, the Gym Leader. He uses Electric type pokemon and after you beat him, you will recieve the Dynamo Badge and TM34, Shock Wave.
Rock Smash Guy's House- Here, if you talk to the man sitting at the table, you can get HM06 Rock Smash.