>>58741628>>58741634PLA excluded all variants that were not Hisuian aside Vulpix/Ninetales and Sneasel but Z-A allowed all regionals from mons that were present in the dex. It's a bit interesting too because they made a third different evolution method for Qwilfish and Black Augurite can be obtained so Scyther can evolve into Kleavor (which wasn't possible in SV). I think the reason is the setting, it doesn't make sense for some Pokémon to be found in Hisui. You could throw them inside space-time distortions like Porygon line but that seems like an awful amount of work for
Pokémon that were almost definitely meant to be replaced with the new variants. One of Z-A sidequests makes a point about travelling and trading regionals which makes sense in a modern setting with easy travel.
