Piledriver is one of three Mad Moves usable by Wario in Wario World, the other two being Mega Toss and Wild Swing-Ding.
Description[]
The move involves Wario spinning into in the air and then pounding the enemy headfirst into the ground, something that instantly defeats most enemies. Performing a Piledriver also generates a shockwave that can damage or defeat any nearby enemies.
Like Ground Pound, Piledriver can be performed by pressing upon jumping into the air, but Piledriver can only be executed if Wario is holding an enemy. Another similarity between a Piledriver and a Ground Pound is that both can breaking open trapdoors, although steel trapdoors can only be opened using a Piledriver.