All attacks except for normal and fighting unless they're typeless.
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Im pretty sure ghost are weak against other ghost attacks and dark attacks.
Ghost type attacks are super effective against both psychic and ghost type pokemon.
Ghost type Pokemon are weak against Dark and Ghost type attacks :) They also resist Poison and Bug type attacks and are unaffected by Normal and Fighting type attacks (Unless Foresight, Miracle Eye or Odour Sleuth is used on them, or if the opponent has the ability "Scrappy.") :P
Water Pokemon with water attacks or Grass Pokemon with Grass attacks
Dark and ghost type attacks And bug