Could Gon Beat Meruem?

When Gon transformed to kill Pitou, Pitou had said that Gon was as powerful as the King himself(Meruem). So does that mean Gon could've actually fought Meruem and have a better chance of winning than Netero? Definitely. Except if you mean younger Netero, who whould have a little chance of beating Meruem.

Who can beat Meruem?

6 Hisoka Morow — he managed to not instantly die when Chrollo's Sun & Moon detonated, meaning that he can take a serious beating. Of course, Hisoka has enough power to handle Meruem, and where he lacks aura, he resorts to trickery, strategy, and the benefit of unpredictability.

Can killua beat Meruem?

Also known as the pinnacle of evolution, Meruem was stronger than any Hunter in existence, including Isaac Netero. The latter put up a decent fight against him, however, the difference in skill was just too massive. Killua stands absolutely no chance against Meruem.