When you reach the second to last room in the Cave Of No Return, you
will come to what seems like an empty room but as you enter the room a
little farther into the room Shadow Link will make his presence known.
He will throw bombs at you. Use your bow to either shoot one of the
bombs that is near him or just shoot him. The arrow will stun him for a
few seconds. As soon as you hit him (you will see stars swirling around
his head), attack him with your sword. Keep repeating this process of
shoot then attack. Eventually he will take off his tunic and his tunic
will change colors of one of the four Links.( Which ever color he
chooses either Blue Purple Red or Green, you must use that Link to
finist by pressing the X button him off with the same process mentioned
above shoot then attack wile the other three Links sit back and watch.
After that it doesn't take much for him to fall