What in the blue hell, would Hulk do to defeat Eternity/Infinity, Galactus, Living Tribunal, or Spectre?? Or said another way, how would he defeat beings who could cause him to cease to exist just by thinking about it?
Thinking the Hulk out of existence would obviously only enrage him to a point he has never been before. He would get so pissed that he would pummel himself back into existence, then proceed to get more and more angry so that he will grow as large as any such opponent. How could he possible grow bigger than an entity such as any of the previously mentioned (some of which size is not even a real aspect of their being), you ask? Simple: Hulk will continue punching himself into existence every time they destroy him, and then punch himself in the face (and balls, naturally) to make himself angry enough to expand to the point where he, quite literally, becomes reality as we know it. At that point it is a simple matter of punching any such omnipotent opponent until they admit that they don't exist creating a paradox and imploding all reality. Then, since there is nothing left, Hulk can punch himself back into existence (in both the face and balls again, of course) which would create a big bang fashioning the universe in his own image. You thought Planet Hulk was a good read? Try Reality: Hulk. Hulk punches his own balls and face until he quite literally becomes Eternity, Infinity, the Living Tribunal, God, and most importantly Gnort.