Metal Mario

Metal Mario is Mario's other rival besides Donkey Kong, and Wario. He first appeared in Super Mario 64 as a power up. He also appears in Super Smash Bros. and Super Smash Bros. Melee as a boss. He appears in Mario Golf for the Nintendo 64 as the last unlockable character. He also appears in Mario Kart 7 as an unlockable character and served as the replacement for Waluigi. He then continued to appear in Mario Tennis Open as a non-USA unlockable character.