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Onix (Base Set BS 56)
[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 — 56/102 — Common
As it grows, the stone portions of its body harden to become similar to a diamond, though colored black.
feyblade
Say what you will about its combat effectiveness and its total lack of cohesion with the fighting types you would actually want to field, this guy was THE original basic wall.
Dr. λ the Creator of Variables, Binder of Variables, Applicator of Terms, Checker of Types, and β-Reducer of β-Redexes
It has tough competition from Chansey who had more HP, a resistance, and could block all damage for more lenient energy requirements, but on a coin flip.