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.
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You cannot get a Skull Fossil (Cranidos) in Pokemon HeartGold.
No. Ghost and Dark is super effective to Psychic Pokemon. Fire is super effective to Grass, Steel, Bug, and Ice.
Steel is super effective against rock type pokemon.
ground type Pokemon are super effective against poison type Pokemon.
Super effective on Electric---Ground Super effective on Flying---Ice, Rock, Electric If you mean super effective on an electric/flying type: rock and ice.