The way I did it was fairly easy. Just jump away constantly, and wait for him to taunt. Then you do the Back - Forward - B (on 360) attack. What's that move called, I'm brain dead from too much mk at the moment. Um.. His Torpedo thingy. Just repeat that over and over, it's really simple.
It's nice because it pushes him all the way back to the other side of the screen. That way you don't end up trapped and trying to get away. Also jumping is a bit Risky because he can throw those spears at you, but if you're ready for them, after a couple times getting hit, you'll learn to quickly duck them, or block them.
Also don't go for the Xray, instead use your bar to make your Torpedos do more damage, so the fight ends quicker.
It's nice because it pushes him all the way back to the other side of the screen. That way you don't end up trapped and trying to get away. Also jumping is a bit Risky because he can throw those spears at you, but if you're ready for them, after a couple times getting hit, you'll learn to quickly duck them, or block them.
Also don't go for the Xray, instead use your bar to make your Torpedos do more damage, so the fight ends quicker.