it doesn't do anything really it's just a task to give you an item
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step on a button in front of the generator
you have to shut down the generator and then go back to the gym leader and then you'll see.
The cave Wattson, the Mauville City Gym Leader, tells you to venture inside is New Mauville. He wants you to turn off the generator inside New Mauville. It appears to be acting up and causing problems for people in Mauville City. Inside New Mauville are various items and switches that allow you to navigate through New Mauville and reach the generator. There is also wild Pokemon in the power plant like Magnemite, Voltorb (Three fake items are Voltorb), Electrode, and Magneton. To reach New Mauville you must head south of Mauville City and use Surf in the lake located in Route 110. Surf below Cycling Road and you will see a cave entrance. That is New Mauville. To enter the power plant, it requires the Basement Key (Which Wattson gives to you after taking the request). Hope this helps.
Stand next to it, face it, then press a
From Mauville City, go south, you'll meet the Fisherman. Surf and keep to east. Then, you reach the New Mauville.