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Friendly reminder that as of SM, all of these gimmicks we keep seeing aren't meant to have staying power beyond the game they're introduced.
They're meant to be base-level efforts to pander to the current generation of Japanese children of that time, a novelty devised in response to the turbulent era of Gen 5-Gen 6 where Pokemon was perceived by Japanese youth as "a franchise for adults", which is exactly why Yo-Kai Watch was able to spring up and mog Pokemon's JP popularity for a few years.
These gimmicks are supposed to offer a level of "personalization" for that generation of JP kids, giving them a novelty that they can call "the cool superpower from THEIR game", giving a greater sense of attachment to Pokemon in their developmental years and higher odds of them growing up into Pokemon consoomers.
If the gimmicks returned in the games to any capacity, they wouldn't feel as "personal" anymore, which is why you don't see them come back, even to a point where other games in the same generation don't share the gimmick.
