Cresselia~~
Junichi Masuda likes this!!
and that most human shaped egg group Pokemon are either fighting or psychic.Sabrina says some stuff in FRLG and HGSS that supports this theory a bit.
"Psychic power isn't something that only a few people have. Everyone has psychic power. People just don't realize it.
This supports the idea that psychic powers are inherent in humans just as they are in Psychic-type Pokemon species.
"Your love for your Pokémon smashed my psychic abilities... The ability to love, I think, is some kind of psychic ability..."
People use their psychic powers passively, without realizing it is an ability, as Sabrina said. Although I'm not sure if she actually meant it literally or was just being poetic.
Caitlin is also suggestively psychic.
However, N seems to be immune to ghost attacks (from the anime though)