>>48984377All the way back in their debut episode, Jessie did this. She dressed up as a gardevoir to disguise herself. That implies they have some level of resemblance to people.
That episode’s gardevoir also had a very normal sounding voice in the original Japanese version. It was like a human woman saying sana sana sana.
So yes, they WERE presented that way, at least way back in that episode.