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Summer Event
I think there should be a summer Event, and the Pokémon that become available are the alolan forms from Sun and Moon. And if there are stat differences between standard and alolan in S&M, then calculate the stats and cp accordingly (For example: standard Raichu- atk=193, def=165; alolan raichu- atk=201, def=172)
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They just feel like weird creations to me unfortanetely :(. That's of course just because I never played those games on the game boy.
Also all these mega evolutions devaluate the Pokemon in my opinion. But oh well, by the time they introduce them it's gonna be the year 2133 and I'm probably not playing anymore :D