When the final Boss jumps to the platform you are standing on, he will lunge at 
you with his sword. Right before he swings it, dive out of the way. If done 
correctly, he will trip and fall. Quickly grab his sword from the ground next to 
him before he gets up and start attacking him with it. Note: The sword can be 
used to hit three consecutive times by quickly pressing RT(3). If he manages to 
get away, he will summon his sword back to him. After this happens, just wait 
for him to jump back onto your platform and repeat the process.