Giving this to King Kong. Random encounter Hulk somehow gets to King Kong or King Kong's offspring and they square off. (offspring is the same thing as him but just saying because I want to avoid canon fits)
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Yeah the battle would last a max two minutes but I think Kong could do some damage to Hulk at first with punches or throwing boulders or large trees or something. When Hulk starts hitting Kong he'd be smart enough to run away and depending on the setting - such as his homeland - he might be able to get away, but there's no way he's beating Hulk