I mean… this would be a thing that exists in this kind of world. Only thing that would really change is how underground it is, depending on how society reacts to people lusting after Pokemon.

Just how many rare candies did it take to get asses like that any way?!

In the pokemon world, at least in Sinnoh, there are books that mention marriages between people and pokemon. Then again such was in an old history book so maybe there was a reason humans and pokemon no longer interacted… and the fact that several pokemon species seem born, or at least implied to be, created from humans. Phantumps and Yammask or even Kadabra