Professor Belmondo's Magneton is used by
Dark Clembot for criminal activities as well as Pokémon Battles. It destroyed a lot of merchandise stored in a warehouse for the newest electric appliances.
Later, it battled against
Clembot and
Clemont's Heliolisk at the Miare Art Gallery.
Dark Clembot battle style was programmed to push its Pokémon hard to the point that the only thing that mattered was winning.
Professor Belmondo's Magneton lost the battle as according to
Clemont, prioritizing partner Pokémon is what makes an excellent robot for Pokémon battles, not caring about them and pushing them past their limits.