Helmaroc King

    The first thing you should to do defeat Helmaroc King is go into one of the huts and pick up the Magic Hammer.  He will be flying overhead and dropping bombs and boulders on you, so avoid those.  There are several bomb flowers in the area, so pick one up when he's flying around, and if he swoops in low, throw it at him, this will cause him to crash into one of the huts.  Enter the hut that Helmaroc King crashed into and start hitting him in the head with the Magic Hammer repeatedly.  Repeat this process until his mask is knocked off.  Now that his mask is off, Helmaroc King will swoop in low every time.  Use bombs again to knock him to the ground, which will stun him, then use your sword to attack him while he's on the ground.  As always, using a formation where 2 or more Links can attack him at the same time is the fastest way to defeat him.