>>50335400That NPC was made entirely as a joke, in the area where you will find only joke NPCs. Think about it, XY is literally the most transphobic region, X stands for the XX(female) chromosome and Y for the XY(male). There is no Z version because you will never be anything but a man/woman.
Also the same region of the Gen that detrannified the Marill line, while also turning it into a fairy.