Step on the red button
step on a button in front of the generator
Mauville City But you have to beat the city's gym leader before you can turn off the generator in New 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.
It's the Gym Leader, Watson, electric guy, after you get a few bages he gives you key to turn off some generator and then you go bakc and he give you TM24 Thunderbolt
in his gym in mauville city, as well as in the square of mauville city after you earn surf, at which point he will send you to turn off a generator that is going out of control, at which point you can grab some rare and powerful electric types.
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.
you can get it after you beat the 5th gym. you go to mauville city and Watson is going to be there. talk to him and he will tell you to shut off t he generator in new mauville. you surf there ans you g=find a thunderstone at the end.
After you beat your dad, go back to Mauville. You will see Wattson standing outside. He will ask you to shut off the generator in New Mauville. After you do that, return back to him. He will thank you and give you the TM thunderbolt.
The generator is located in the underground city of New Mauville. You must walk down the path at the bottom of Mauville. When you see the man fishing, stand to the other side of him. Here, you use surf. You should see a cave after surfing a small distance down the river. Enter through there. You must toy with the buttons to open doors and at the end you will find the generator. Press the red button in front of it to turn it off. If you go to the side, you will see a Pokeball, which contains the Thunderstone. This stone will only evolve Eevee, Voltorb, Magnemite, and Pikachu. (Although I suggest that you save it to evolve Eevee.)
When turning a generator to a standby operations mode, there is often a switch on the generator. By turning the switch on and off, you should be able to use the generator should the power turn off and resume electricity which may have been interrupted
It's the same Wattson event as in Ruby and Sapphire, but now you have to wait until after the Kyogre/Groudon event to be able to unlock the sidequest. Find Wattson in the middle of Mauville, go to new Mauville and turn off the power, and return!
Yes, it is recommended to turn off the portable generator before turning off the appliances it powers. This helps prevent potential damage to the appliances from power surges or fluctuations when the generator is turned off.