User blog comment:Rmkane/Alolan Forms Coming to Pokémon GO!/@comment-3123413-20180522221247/@comment-3123413-20180523180750

Yeah, my bad with Mew/Meowth. But it is kinda logical anyway, as whenever any Pokémon of its family is announced/teased to be released the rest of the family is released as well. I mean they wouldn't just add Alolan Vulpix and remove the evolution button from the Pokémon summary page for fun.