the main boss it a three part battle, one at the end of the temple of the ocean kin, the next at sea, and the last in the wreckage of the ghost ship.
that depends what boss your fighting.
Blaaz
One word-Bellum
beat bellum, the final boss
Use it to get to the boss key and the and get to the boss.
You have to blow up the corrupted ghost ship.
Bellum is the final boss in the Legend of Zelda: Phantom Hourglass(A.K.A The Evil Phantom).
no u use a boss key
the boss guarding the aquanine is Eox, Ancient Soldier
Depends on which game and your point of view. Personally, my favorite boss is Eox in Phantom Hourglass
the boss of the 2 headed dragons the boss's name is Gleeok. after you defeat Gleeok you will get the 2nd metal of the phantom sword
Boss keys are always very close to the bosses lair in Phantom Hourglass because you have to carry it.