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Pray tell, why are ghost type pokemon against the rules? It's not that they have no weaknesses. They're weak to ghost and dark. You should be more specific and just have glitch pokemon, blank space pokemon, Spiritomb and Sableye (as the only pokemon with no weaknesses, do have a second type, so, your ghost rules only excludes mistreavus, shuppet, bannette, Duskull, Dusclops, Mismagius, and Dusknoir, which do have weaknesses to things)

I think you ought to clean up the rules a little bit.