Hard Knuckle

Hard Knuckle is Hard Man's power. Hard Knuckle may be slow, but it packs a punch (sorry, it had to be said). This also serves the same purpose as the Crash Bomber in that it can break through certain barriers (though these only appear in the first and third sections of Wily's hideout).

It should also be noted that you can slightly guide them up or down once they're moving.