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The only way I know of to get a super effective hit on spiritomb is to have a Pokemon use foresight on it and then attack it with a fight type move.
Dark Pokemon, with the exception of a few, including, but not restricted to Spiritomb, Sableye, Drapion, and Honchcrow, are all weak against Bug- Type and Fighting-Type moves.
Spiritomb is ghost and dark type. Fighting is good against dark but it doesn't affect ghost. Use................................................... anything besides psychic, fighting, and normal.
Water and Grass attacks are super effective against Onix.
Ghost & Flying. I believe that's it! Not dark or bug because although they're super-effective against Psychic, they are not-effective against Fighting. And not Psychic, because though it's super-effective against Fighting, it's not-effective against Psychic.