Admittedly, the concept is rather new to me as well. Rotom inhabits machines like the washing machine that it is currently within, but it has a semi-physical body apart from such vessels. I learned of an actual body construct after spending time here on Prismatica!

[Since one of his acquaintances has one.

On the topic of Magneton, he returns the smile, pleased by Connie's excitement over it.]

Correct! The circumstances of their origins are still quite the mystery, but it is clear that Magneton have existed for a very long time. They even predate humanity's use of inanimate magnets...to our current knowledge, at least!