>>29899929This is probably how it works:
-Kanto form holding Everstone + Alola Form/comparable parent = kanto form baby
-Kanto form without Everstone + Alola form/comparable parent = Alolan form baby
As for later generations of offsring in case 2 with the Alolan baby, holding an Everstone will probably just affect Nature, no reason why I would give birth to a Kanto form.