Use the following trick to defeat the creature on the last level at the dock. The big creature will smash open a gate that has a control device that will lower a machine that shoots out a purple beam. Dodge the creature's attack and stand so a beam will hit you. There is a delay between beams. After being hit, you will glow. Press R1 to throw a glowing ball. Aim for the red spot on its chest. Keep throwing balls until the creature falls in the water. If you cannot throw any more balls, stand under the beam to recharge.