Anyways, this looks like the final battle of Rayman 2, first you must throw back the Grolgoth's bombs at it, and actually you have to fight him above lava...
I wasn't surprised. It is based off of both Rayman 2 and Rayman 3, though only a small part of R3. (After all, the hoodlums were only in one level) Story, most of the enemies, levels, et cetera.
That boss battle was like the GameBoy Advance version of The Crow's Nest.
If they do not burst like Robo-Gorillas in water, they will get so rusty that they cannot move anymore. By having the clouds raining on, them, Globox got rid of pirates by having them rusting.