>>29328505Cute, childlike proportions, eyes, ect, are all commonly associated with animals, and thus are much more attractive as pokemon.
When Pokémon start taking the shape and mannerisms of adult human women, people lose interest.
It's not necessarily a sexual thing, although you could say that someone willing to fuck a Pokémon is likely not going to be interested in the ones that look the most human, because that isn't where the fetish for monsters is going to be reached. Gardeviourfags being the obvious anomaly.