There will never be human X pokemon because Gamefreak is scared of alarmist journalists making clickbait articles with titles like “Pokemon Promotes Bestiality?” with shit like Ash making out with Pikachu as the header images. Articles saying shit like “Pokemon revealed Delia is in a relationship with MR. MIME who’s a POKEMON which is an ANIMAL, meaning it’s promoting BESTIALITY to YOUR KIDS!”
The writers want to do it, but they know they can’t. That’s why they keep making “jokes” about it, like the girl “meeting a guy” who turns out to be a Machamp, or the guy saying he wanted a Wobbuffet body pillow, or picrel. They know that if they actually did anything more than an obscure joke, it would cause confused facebook moms to boycott Pokemon because clickbait convinced them it would make little Billy want to fingerblast the dog.