The type effectiveness of bronzong varies according to his 2 abilities:
1. Levitate = Weak to fire.
2. Heat proof = Weak to ground.
But to make this simple you can say that in-game bronzong is only weak to fire, since every in-game bronzong has the ability levitate.
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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
psychic pokemons and attacks are super effective
Rock, electric, ice, and psychic types are super effective against Crobat.