I hate his rotten ass guts. Anyone know what to do to him after shooting and jumping are out of the question (Because he ducks underwater whenever you do either)? I tired ramming him into a wall, but it's not easy.
"Boy, I wish there was someone here to stop me from ****ing all these kids!" -Burgess
I'm working on that boss as well. Early in the fight you're able to jump on him when he's busy doing that claw attack, which seems to erode his crusty shell, but at that point he begins to avoid the jump attack so perhaps another method of attack will be effective at that point. I'll keep at it and let you know if I find the trick.
I finally figured it out! First, as I said before, he is most vulnerable during his first phase when doing his stationary claw attack. Take that opportunity to hop on him, and after a few successful attacks some of his shell will fall off. At this point, try to remain on the ground because jumping will cause him to retreat underwater from where he'll launch 3 tricky to dodge missiles. After remaining on the ground long enough for him to reach the end of his movement cycle, he'll usually pause on the touch screen for a moment before launching a single missile. This pause before launch is your chance to nudge him by his unprotected section into the side. 1 or two such nudges should finish him off. Good luck!