A good way to dodge the poison balls of form 2 is to swim along the wall, away from him. After the last one hits the wall, reverse course and shoot. The same trick works in the final Battle Cosmic, dodge toward him, and the energy balls impact his body.
Also in that battle, you can shoot the blue face with energy form while sitting above where the big beam appears, much safer. And as you can keep a stream of shots in flight, you do not need to get the timing right.