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Water and Grass attacks are super effective against Onix.
The types that are super-effective against ground Pokemon are Water and Grass.
Flying type moves are super-effective against grass, bug, and fighting Pokemon. However, they are only half-as-effective against electric, rock, and steel Pokemon.
Grass-type moves are super effective against Ground, Water, or Rock-type Pokemon.
Since cranidos is a rock type Pokemon, any Pokemon that can learn a water, grass, fighting, steel, or ground type move can be super-effective against it.