Crayk

Crayk (甲殻巨大種 レヤード, Shelled Giant: Reyaado) 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 off an arrow, (on the top screen, you will see Link aiming at you) 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. When in his shell, throw bombs at him. You can also shoot arrows at the purple orbs surrounding the shell or slash them to break them (slashing is easier, but more risky). Crayk's shell will fall off, and he is vulnerable to being attacked on it's tail. Fire arrows at him to stun him and slice the 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.

Trivia

 * Though hard to see at first, Crayk actually has the Kokiri symbol on his shell repeated over several times.