>>34459886The problem with that is it would invert the issue we already have. Three regional variants evolve from common forms. Raichu, Marowak, and Exeggutor.
As of right now, we cannot obtain the common forms legally in SMUSUM. We will be unable to obtain the Alola forms legally in the next generation without the implementation of something new.
It would be a shame, in my opinion, if these three in particular were simply unobtainable in future generations (aside from transfers of already bred, trained, and fully-evolved Pokemon from SMUSUM via Bank)