Agreeing with this. The game already plays fast and loose with pokémon canon, so I don't understand why we're so hung up on that. If we were going to be hyper-adherent, Alolan pokémon should not be found anywhere but Alola. Full stop. Additionally, Type:Null is NOT a legendary pokémon. It is a man-made mimic of a legendary pokémon, and one that is unknown to most if not all of the characters in the game. It's stats are being nerfed and it's probably going to only have access to a single typed Multi-Attack as Silvally.