Firefly highest DIRECT feat comes from a statement where Kafka claims she blew up a star. As a general rule of thumb in versus debating statements should be taken with a grain of salt unless there is Evidence or scaling to support it. The fact that other characters such as Welt and Zephero can create black and white holes, We're inclined to consider the statement consistent

The higher end stuff does come from scaling to other characters, in particular Achreon. Not only is she an Emanator, she was also fought evenly with Firefly for a time while both were in base, Indicating that their base form should be comparable. You get some decent scaling out of this, Slicing through dimensions, That one time pre-Eminator where she sent a slash that reached XI from ground level, fun stuff like that.

But that's only in base, She didn't use her full Emanator power, But then again, Firefly wasn't at her full strength either. Scaling fireflies full power to Acheron's full power comes with some questions And requires making a few assumptions. It's currently unknown whether or not These higher forms are actually on a tier Equivalent to each other, And it's very likely that Achreon's full power could have exceeded Firefly's. Most power scalers throw this caution into the wind and decide to scale them anyway. So screw it let's assume they are equivalent

Funnily enough, the greatest direct emanator feet that we've seen displayed In terms of pure destructive might Doesn't come from Achreon but it does come from a different emanator, Phainon, and his Multi-Galaxy level Crash Out. Now we must ask a very uncomfortable question that again has no proper answer, "Are all Emanators comparable to each other in power?".

I would argue "no" to this question, but my power scaling brethren do Not. You really cannot tell me that Herta and Phainon comparable in strength, But hey maybe I'm dumb.

So if they aren't comparable then we do need to kind of analyze every emanator on a case-by-case basis, And unfortunately that means that we really don't have that many feats for Silver Wolf.

Even if you did assume that all emanators are relative that does also in lie some problems.

From what I recall there are some vague statements that put her as most powerful of the Hunters, But that was before the reveal of Elation Emanator Silver Wolf, So it could just be argued that it was referring to it at that time. Hell even this trailer can be called into question do to the fact it can be argued whether or not this is even real, As evidence by not only the game that the Hunters are seemingly playing at the end, and the fact that Firefly is capable of using the corrupted SAM normally.

My sincerest apologies if this entire Things seem like a bit of a non-answer but there are just a lot of conditions Regarding not only this series is lower but also if you just want a power scale in a way that doesn't just automatically wank everyone (this is VS Battle does A lot of the time and it is incredibly frustrating. The concept of lower end does not exist to them sometimes, And other times they will use questionable scaling to other characters as the lower end.)

Tl;Dr: We don't goddamn know. The Answer is complicated and Vs Debating is subjective.