yes he can pop through universes no it’s not canon
yes the formes canonically exist no it’s not confusing

Whenever Savior enters his friends’ universes, usually via Wormhole Tunneller, the designated Forme of that universe is supposed to be created upon re-entry to his own world. Poké!Forme didn’t get the memo immediately, despite the Pokémon world easily being the second most prominent world Savior travels to, excluding his own.

There are currently two wide-spread known Formes that Savior has, though he has travelled to eight worlds total…and there’s doubt that the remaining six will show themselves to the public.