Maoh the Giant

Maoh the Giant (マオー・ザ・ジャイアント) is the boss of the Intro Stage of Mega Man X3. A huge Mechaniloid that was part of Dr. Doppler's army when they attacked the Maverick Hunter Headquarters. It attacks by punching with the large, spiked steel balls attached to its arms, crushing its enemies and building alike. It's only weak points are its head and arms. Unfortunately, all you have is the X-Buster. But, he takes a lot of damage (almost all of his damage) from Zero's Z-Saber.

Trivia

 * A similar robot, named Hell the Giant, appears in Mega Man Zero 4.