you have to shut down the generator and then go back to the gym leader and then you'll see.
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You can get a magnemite in New Mauville.
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.
First beat the Mauville Gym leader, Wattson.
From Mauville City, go south, you'll meet the Fisherman. Surf and keep to east. Then, you reach the New Mauville.
if you are looking for the new mauville basement then you have to go south of new mauville and find a place to surf in the route between mauville and slateport and you will find it on the right side of the screen