Just to make something clear, Gon's jajanken is definitely leagues stronger than any individual hit from Bodhisattva. The whole purpose of Netero's hatsu is hitting quickly and endlessly. Gon sacrifices speed and stamina for strength, it's freaking tough! But no, it wouldn't be enough to kill Meruem, it almost certainly wouldn't even be enough to even defeat Youpi but it would damage him. And who knows, a dozen consecutive jajankens to Meruem's temple might just do the trick but Gon would certainly exhaust himself before that point, however, Meruem is not invincible. It is unclear if Meruem would be significantly affected by Killua's thunderbolt attack. He would certainly be less affected than Youpi was. However, Killua's major advantage is his incredible reaction time. Meruem movements are limited by the speed at which his nervous system can relay signals. Killua's ability allows him to surpass this limitation so he has a faster reaction time than Meruem even though he isn't physically as fast. But he would definitely be able to land some blows while in Godspeed. Netero can punch faster than the speed of sound, this ability surpasses the speed of any other character's ability but it is only for that ability specifically. Killua can respond to any other ability in a variety of ways faster than anyone dependent upon their nervous system. However the nature of Killua's ability is somewhat unclear to me. If he can turn his Nen into electricity why does he need to charge up? Does he completely expend all of his Nen as electricity then take in more electricity by converting it back into Nen? Because that would be really cool but, if he's literally charging up with electricity then that's stupid, humans make terrible batteries. Anyway, we can assume that no matter what Gon does he cannot defeat Meruem. Netero's Zero Hand literally transferred all of his aura into damage. Gon has significantly less aura than Netero so he cannot do more damage than that. However, we can say equally confidently that Über Gon could have defeated Meruem. Über Gon was able to completely overwhelm Pitou with just straight punches and his Jajanken entirely crushed her. Pitou ascertained that Über Gon could have killed Meruem and the Chimera Ants have never made a mistake regarding relative strength thus far, I see no reason to doubt them now. Also never say never guys I'm sure that Meruem could have earned a visit from Über Gon if he tried say killing Killua. I think that Über Gon could have still killed post-rose Meruem. He was really just Meruem plus two of his royal guards and Gon proved with Pitou that Royal Guards are like ants-subtle analogy here- before his power.
