To address everyone's arguments:
Firstly, I'm not even sure why Kirby cracking Pop Star in Megaton Punch is rated as a Planet level feat. In order to be a Planet level feat, he'd have to destroy the planet outright, which he did not. Furthermore, there's actually an in-game counter that guages the strength of the contestants' punches, and the cap is 201 megatons if all the commands are timed perfectly. 201 megatons is Large City level at best, and the fact that Pop Star was cracked in half by a punch like that says more about Pop Star than it says about Kirby's overall power.
Secondly, about Super Sonic, he scales to Dark Gaia,
who in a weakened state was able to output 7.2 yottatons of power or greater, which is actually
Large Planet level; the only reason he's not rated as such on his page is because our Attack Potency chart which we use to rate characters based on power output is out of whack, to the point where destroying the Earth would be rated as a Moon level feat. We were trying to revise it a month ago, but the project got pushed back into December.
Thirdly, I concur with The Everlasting's assessment of Hypernova Kirby; he works by returning fire to his enemies with an improved inhale in classic Kirby style. He can also just inhale some enemies outright, as he did to Flowery Woods, which would result in a BFR. I do not think it increases his durability, since he still takes the usual amount of damage from enemies. As for whether or not he can inhale and BFR Super Sonic...
Thirdly, on Super Sonic being able to escape black holes, I presume what is being referred to is the Egg Salamander's attack in Sonic Rush. In which case, I'd like to point out that it was actually Burning Blaze that did this, as this attack was exclusive to the phases in which Eggman Nega was piloting the Egg Salamander and fighting her. Not that it really matters, since it would scale to both of them anyway. What matters is whether or not this "black hole" fits within
the regulations we have placed on those kinds of feats. It certainly does not seem to be shaped like a black hole, as it stretches across the screen, and seems more like a rip or bend in space-time, but then again, that is essentially what a black hole is. I'm admittedly not very well-versed on the physics behind gravity and black holes, so I'm not the one to settle this. If it isn't an actual black hole, Kirby can most likely BFR Sonic; if it is, he probably can't.
Lastly, I honestly doubt that the area where Dark Nebula was fought in Squeak Squad was actually a black hole, and even if it was, claiming he has Large Star level durability simply from that is as ridiculous as claiming everyone and their mother has resistance to heat and fire because they can walk through volcanoes.