actually, he is wrong, it is very simple, find the yellow button or some other color 98% sure its yellow. Butt bounce on it, and a metal ball will appear, walk through it to have a metal coating.

the beasts fire ball wont be able to hurt u when you're metal, but be warned, they can knock u off the edge. wait til he throws one, then at the right moment jump to another ledge, then jump onto the platform that the beast is on, now with the metal coating on, butt bounce on him, thats the way u defeat all those kinds of monsters. hope this helps! good luck! oh, and when u have to beat clyde, always butt bounce on his head, when u get to the 4th boss, you'll know what i mean! i hope this helps! good luck!