Diamond: It lived in jungles around 100 million years ago. Its skull is as hard as iron.
Pearl: It was resurrected from an iron ball-like fossil. It downs prey with its head butts.
Platinum: A lifelong jungle dweller from 100 million years ago, it would snap obstructing trees with head butts.
Heartgold: CRANIDOS toughen up their already rock-hard heads by headbutting one another.
Soulsilver: CRANIDOS toughen up their already rock-hard heads by headbutting one another.
Black: A lifelong jungle dweller from 100 million years ago, it would snap obstructing trees with head butts.
White: A lifelong jungle dweller from 100 million years ago, it would snap obstructing trees with head butts.
Black-2: A lifelong jungle dweller from 100 million years ago, it would snap obstructing trees with head butts.
White-2: A lifelong jungle dweller from 100 million years ago, it would snap obstructing trees with head butts.
X: It was resurrected from an iron ball-like fossil. It downs prey with its headbutts.
Y: A lifelong jungle dweller from 100 million years ago, it would snap obstructing trees with headbutts.
Omega-Ruby: It was resurrected from an iron ball-like fossil. It downs prey with its headbutts.
Alpha-Sapphire: A lifelong jungle dweller from 100 million years ago, it would snap obstructing trees with headbutts.
Sun: It lived in jungles around a hundred million years ago. It used its skillful headbutts to combat Aerodactyl.
Moon: In rock layers where Cranidos fossils are found, the fossilized trunks of trees snapped in two are also often found.
Ultra-Sun: A primeval Pokémon, it possesses a hard and sturdy skull, lacking any intelligence within.
Ultra-Moon: Its hard skull is its distinguishing feature. It snapped trees by headbutting them, and then it fed on their ripe berries.
Legends-Arceus: An incredibly rare sight. They duel each other by ramming their heads together, and the resulting sound echoes throughout the area like the pealing of a bell.