Thunder Claw

Thunder Claw is Clown Man's weapon. Mega Man launches an "elastic" beam of electricity that can not only attack, but is tensile enough to swing from certain hooks. It can reflect Grenade Man's bombs back at him, but this is risky.

Trivia
The fact that Thunder Claw can grasp on to hooks may be a subtle reference to another Capcom game series, Bionic Commando.