Go to Hazy Maze Cave with Yoshi. Choose Wario's hat when coming in, then take the left route. Long jump (dash, crouch, then jump), go through the door, then go across the wire until you reach the falling rocks. Go to the black brick to your left, break it, then dash quickly to the rocks (do not get the mushroom), so that they hit you. Your cap will fall off. Quickly hurry back to where the black brick was located and get the mushroom. Jump back on to the land. You should now be a Big Yoshi. Press A. Notice that instead of swallowing, he will punch (like Mario, Luigi, and Wario). If you press A(3), he will kick. Note: This may take require a few attempts.