Gliscor is weak against ice and water type attacks.
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Gliscor, being a Ground/Flying dual-type, is weak to Ice (x4) and Water (x2). Gliscor is resistant to Fighting, Poison and Bug (x1/2) and immune to Ground and Electric (x0).
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