Onix (Base Set 2 B2 84)

Onix — 90 HP — [F]
Basic

[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.)

weakness: [G]×2
resistance:
retreat: 3

Illus. Ken Sugimori
Base Set 2 — 84/130 — Common

As it grows, the stone portions of its body harden to become similar to a diamond, though colored black.