The fake P.G (phantom Ganon) is DARKER than the real one. The real one is a LIGHT purple. Then when P.G gets off his horse (this is a little bit harder) he will float around the room, throwing fire balls at you. Hit them back at him with your sword (this may turn into a mini tenis match
) but whatever just keep hitting them at him. Keep in mind that just because you returned P.G's fireball back at him doesn't mean that is will automatically hit him. After you DO hit him with the fire ball, he falls to the ground. Hurry and slash him as much as you can with your sword. Repeat this until he dies and Ganon says it was a waste of a creation and you still suck. Get your reward and warp out! Gooooooood job