Instructions
Run around the level using the control stick to dodge the bull's attacks. Press the "A" button to jump out of the way of projectiles.
Dodge the bull's charge attack successfully to cause the bull to become dizzy. It will remain in this state for a few seconds.
Shake your Wii remote to attack the rider on the bull's back when it is dizzy. This is the only time that you can successfully attack.
Repeat the strategy of dodging the bull's attacks until he is dizzy then attacking him while he is vulnerable, to eventually defeat him.