[...That was a long, strange and complicated explanation, but Ash thinks he kinda understand the gist of it. As much as anyone with absolutely no other context can, that is.]

Ah. In that case, still no. Pokémon only have one physical body that actively changes, even the ones like Magneton that look like they've split or cloned themselves. It's more like... instantaneous puberty, with a few species that just decide to completely change their style along the way. Or like those scrawny civilians that magically become muscle-bound superheroes in movies, except they don't change back.