Some time after the stories, scientists were able to restore human fertility, remove the need for taming, and create pokéboys. With no need for humans and pokegirls to interbreed, the two groups reached reproductive isolation, after which the more unstable DNA of the pokepeople turned them into true monsters. People didn't want to think about the bad old days when everyone was a rapist, so they forgot about it, possibly to the point of mentally blocking out knowledge of how pokémnon breed (that or they just don't tell the 10 year old kids about the age of rape).