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Psychics are weak to bugs because of the simplicity of a bugs brain. Psychics have no power over the bugs because the Psychics are too far beyond a bugs brain.
Dark type is strong against Psychic because Dark types fight under handedly and hack Psychics. Similar to the way bugs are too dumb to be effected by Psychics, Darks are too "dirty" and sneaky. Same thing for Darks vs Ghosts.
Ghost vs Psychic is explained away by Ghosts are not living and do not have minds
