Crayk

Crayk is the large, hermit crab-like boss in the Temple of Courage in Phantom Hourglass. When the battle starts, it turns invisible. but, on the top screen, you see from Crayk's viewpoint (presumably because of the second half of the Fairy of Courage he is guarding). When the top screen shows him charging at Link, fire of an arrow, and he will withdraw into his shell. If you fail to do so, Crayk will grab you, and you must move the stylus back and forth in order to break free. After a bit, Crayk's shell will fall off, and he is vulnerable to being attacked on it's tail. After doing this a few times, he will turn into Sands of Time, you will get a Heart Container, and the second half of Ciela.