Gaia and Agul? Well, I can try. But it's the AP that's going to be hard. There are multiple feats in there. Such as...
Antimatter: Was going to turn the entirety of Earth into anti-matter and annihilate the entire solar system. But of course, dude was prevented from doing so. However, after a short rewatch of the start of the episode, Antimatter made its appearance by blowing the frick outta a moon of sorts that was close to Jupiter.
The explosion's radius was at least slightly bigger than even the diameter of Jupiter itself. Though, there is scaling to be made and that's going to prove to be troublesome. Though, there are moons of Jupiter that is the size of its Great Red Spot isn't there? While the explosion could mean that the results would only yield around High 5-A to potentially 4-C results, there is something else to take note of: The fact that Antimatter is... well, anti-matter.
There is also Zonnel; who, after a scan from Gamu, revealed that inside its shell is basically a miniature sun. Confirmed via statements of it emitting gamma radiations as well as a nuclear fusion happening inside Zonnel. Looking back, it might not look too impressive. But Bloodborne had the same thing and it was only the size of a human head. Yet, it yielded energy in the Gigaton range. Zonnel is uh... much bigger. It might be worth a shot. I'd do it myself, but hell if I'd be able to even begin the calculation for it.
Finally, there's Mokian: Whose insides contained what seemed to be a pocket dimension that Zebub may or may not have created. Leaning towards likely since he was also the one who made the whole dimension "melt" near the end of the episode. In the pocket dimension, there were planets, most of which weren't even planet sized. However, there were stars as well, including what looks to be nebulas.
Extra: What do you think of the R'lyeh in Ultraman Tiga's movie? We see that it contained multiple pocket dimensions and one of them happened to be a large space containing countless amounts of stars inside it. The Dark Giants might be able to scale, especially Kamila. Why does she scale, you might ask? Well, I'm pretty sure it's her that is sustaining the island itself. R'lyeh is a strange place, so I wouldn't be surprised if the pocket dimension is linked to the island itself. So yeah, basically, Tiga's Universe has a R'lyeh (but why no Cthulhu tho?) and the island contained a couple of dimensions; one of which was a field of stars and Kamila was pretty much sustaining the island as (possibly) proven by the fact that the island was sinking again when she died.
Extra 2: Do you think Hyper Zetton's tier needs to be revised?