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Mismagius is a Ghost type. Therefore, any dark moves such as Bite, Crunch, Pursuit, or Feint Attack will be super effective against it.
In Pokémon HeartGold, the only way to get past the Wonderguard ability is to use a move that's super effective against the Pokémon who has Wonderguard, like in Shedinja's case, because it has Wonderguard, the only way to defeat it would be to use a super effective move against it which would be Fire or Flying attacks.
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.
super effective is bug