Enter Hazy Maze Cave as Yoshi and select Wario's hat when coming in, then take the left route. Long jump go through the door and go across the wire until you reach the falling rocks. Go to the black brick to your left and break it, then dash quickly to the rocks (do not get the mushroom) so that they hit you and your cap falls off. Immediately hurry back to where the black brick was located and get the mushroom. Jump back on to the land and you should now be a Big Yoshi. Press A to punch (like Mario, Luigi, and Wario). If you press A three times, he will kick.