From Mauville City, go south, you'll meet the Fisherman. Surf and keep to east. Then, you reach the New Mauville.
New Mauville city
it is in mauville city it is in mauville city
New Mauville MissionMr. Wattson wants you to turn off the big machine at the end of New Mauville by pressing a red button. The cave's full of Electric-type Pokemon and no Trainers.
In mauville city!!!
Mauville City But you have to beat the city's gym leader before you can turn off the generator in New Mauville City
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.
It’s in New Mauville, which is a cave on a tiny island southeast of Mauville City. You’ll need HM Surf to get there.
Go south until you are below and out of Mauville City, and Surf in the water until you find a cave: That;s New Mauville.
You don't get a Master Ball in Mauville City.
You can get it in the bike shop in Mauville City.
to get to mauville you have to have rock smash to get rock smash you have to get to mauville