When your going to fight that big flytrap thingy morph to stealth form and go invisible. Once the beam stops it will make a plastid beatle. Pounce on the beatle and go to gun form. You will be holding the beatle. Then when the flytrap is about to roar, shoot the beatle into its mouth. Repeat this until the flytrap opens. Then get out your sword and hack away until it dies.