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You know, I've actually thought about this kind of thing. Other monster-collecting games have had fanmade monsters made into real ones through contests and stuff.
Digimon has had plenty of them. Some of them are significantly changed, which probably sucks for the people who had a real vision but was also probably a good call in cases like that one person who kinda just traced a Megaman X character and submitted it, but really though the bottom line is that it's just cool that Digimon has that many of them.
Yo-Kai Watch has had just 2 fan-turned-canon monsters, but they're both very faithful, advertised consistently, and one of them even has its own little overworld event and exclusive items.
I can't imagine Pokemon EVER doing it themselves, though. I guess it's just not something they've ever considered doing, or want to do. Also it'd have to be done pretty far in advance, right? Oh well.
