Rocky was a boss who has so far made his first and only appearance in Rayman 3 (GBA).
In the fight he uses to hit the ground and thus release fire out of it which should be dodged by Rayman. After few attacks a blue orb will appear that allows Rayman to fly up to his head and hit him then. That will make him lose one of his 3 health points. After every hit on him he will suddenly start flying across the screen.
However, you can stand directly under the fire before Rocky releases it and wait for it to hit you. Since the fire goes all the way up to the top of the screen you to can hit him immediately while in the air but it will lose you one health point.