Do you think there’s any relationship between Pokémon like the Magnemite line, the Beldum line, and the Klink line? If so, what might that be?
The ‘mechanical’ Pokémon, that is? Honestly I think it’s impossible to say, although Magearna might shed some light on all of that, once we learn more about her. Voltorb are supposed to have appeared suddenly around the time of the invention of mass-produced Pokéballs, and Professor Juniper discovers that Klink appeared in Chargestone Cave about a hundred years ago, so I wouldn’t rule out their creation having something to do with human influence. I doubt they were deliberately made by humans, because they mostly seem to be thought of as mysterious Pokémon and no one seems to know exactly where they came from, but they might be the result of human activity in much the same way as Grimer (i.e. the waste products of human technology, stimulated by “X-rays from the moon”).