It's notable, but as the Attack Potency page will tell you, even the high end's value of 35.65 Kilotons is 7-C. Funnily enough, Lanturn has a supposedly better feat calculation, according to Reddit. Problem is, it's an enormous outlier.
"Lanturn is known to emit light. If you peer down into the dark sea from a ship at night, you can sometimes see this Pokémon's light rising from the depths where it swims. It gives the sea an appearance of a starlit night."
"The light it emits is so bright that it can illuminate the sea's surface from a depth of over three miles [exactly 5 kilometers in Japanese original]"
"
Yes you're reading this right, the light output of a Lanturn would have to be at least 10^105 Watts for its light to reach the surface. Each second it releases more energy than 10^35 observable universe mass energy equivalents.
So yay for Lanturn being like 3-A with Outliers? Obviously, the only Pokmon strong enough for this not to be an outlier to scale it to are Arceus & the Creation Trio & we already rate them higher than that for their own feats & statements.
Pardon me & that.
(Also, if anyone wants to verify the math in my place, or link to a blog on here that's already done so, I'd love that.)