>>12011860They're obviously oversights. It's nothing that can't be changed simply by overhauling the current type chart or adding new moves and Pokémon. Give Ghost Psychic immunity (already implied by the anime) and better Bug Pokémon (that already resist Psychic).
This guy looks like he could be a cool as fuck pure Bug type that can dish out some damage on those Psychics. Let's just hope he's faster than Alakazam.