Start by continuously charging at the boss and attacking him. Then, do a double jump when he swings his weapon. The axe will stun Sonic, allowing the boss to attack and inflict a heavy amount of damage. He might occasionally teleport across the battlefield to make a series of attacks. First, it will summon lightning to surround itself. It will then charge at you, causing a chain of attacks involving moving the Wiimote and Nunchuk Up and Down a few times.