Ghost and Dark.
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though nothing is naturally supereffective against ghost/dark Pokemon like spiritomb and sableye, if a Pokemon uses foresight, fighting moves become supereffective if neither Pokemon are switched out. good luck!
Dark-Type Pokemon are weak against: Fighting-Types Bug-Types
Water types, leaf types, and fighting types are all supereffective against a rhydon
Ghost types are weak against Dark and Ghost type moves.
Dark, and ghost.