He will shoot blue balls of fire and occasionally red flames across the ground toward you.
When you do enough damage to him, he'll teleport to a machine with a blue pump in it. It will heal him, so instead of attacking him, use your attacks on the pump to destroy it.
Attack him again and he'll teleport to a new pump. Kill that one as well, then repeat. There are 3 pumps he will use to heal; after the 3rd one is down, feel free to wail on him until death. I primarily used X and Laser Eyes, as this is where I got my x30 combo as well.