{F} → Rock Throw : 10
{F}{F} → Harden
During your opponent’s next turn, whenever 30 or less damage is done to Onix (after applying Weakness and Resistance), prevent that damage. (Any other effects of attacks still happen.)
illus. Ken Sugimori · LV.12
Formats: Other: 1999–2001
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As it grows, the stone portions of its body harden to become similar to a diamond, though colored black.
Joe
It says “the stone portions of its body” which implies that there are NON-stone portions of its body. Does Onix have muscles inside the stones? Does it have a brain? It must have a nerve center that operates its eyes. It must have a digestive system—else why would it have a mouth?
Otaku
True… but all the flavor text tells us is that it is not made of “stone”. That could mean flesh, but it could also mean more non-flesh bits, however, they’re made of material we wouldn’t classify as “stone” e.g. they aren’t solids, or at least aren’t hard enough to count as rock.