oh that huge thing you gotta fight that you have to fight joshua and hanemoka ?
ohhh ok what i did is i hid behind one of its tentacle thingys preferably on the right and i just attacked the thing like crazy and nothing can attack you there cause you're out of reach and use your special attack thing as many times as you can ,it makes the battle a hell of all faster and easier and just keep attacking it in the little corner there and if one bubble thingy does attack you move for a sec then move back but i never had to do that so yea though just hide preferably on the right i think it was the 1st tentacle thing and you should be able not to get harmed.