To beat Chill Penguin before you go to the boss area charge your gun. When your gun is charged go in and shoot him with it. Jump off the wall and charge at the same time. Then, shoot him with it. Do this repeatedly unti he is dead. If you have fire wave use that.
To beat Spark Mandrill before you go to the boss area switch to shotgun ice. He will freeze if you hit him. Shoot him until he is dead.
To beat Storm Eagle before you go to the boss area charge your gun. Shoot him with it. Do this until he is dead. If you have chameleon sting use that.
To beat Flame Mammoth before you go to the boss switch to storm tornado. Go under him when he jumps. If you use boomerang cutter on him it will chop off his nose. Shoot him until he is dead.
To beat Armored armadillo before you go to the boss area switch to electric spark. If you hit him with it he will lose his armor. If you run out of electric spark before he is dead use X buster until he is dead.