Reflux has the following attacks.

1. He will spin around in a spiral. To avoid this, run in the other direction at all times.
2. He will send out powerful lasers. To avoid this you must jump over the laser spots on the field.
3. He will make bomb lasers fall from the sky. To avoid this, wait on the climbable wall at the edge of the arena.

To heal, get on the climbable wall that was mentioned above and grab the red Lums. When you avoid Reflux's attacks he will fall back. Whenever Reflux falls back on his rear, grab the Red Can (heavy metal fist) on the climbable wall and go to him. While he is sitting, a target will appear on his magic staff. Hit the magic staff as many times as possible. Repeat this until Reflux dies.