Salamence is a Dragon and Flying-type and because of which its weaknesses are Rock, Ice and Dragon prior to Pokemon X and Y however Fairy-types were added as a weakness for Salamence as of X and Y.
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Being a dragon/flying type, like dragonite, Salamence is 4 times weak against Ice type moves. Dragon type moves are also super-effective but only by x2.
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