For me it is a version who could destroy a universe as a side effect of fighting someone else.

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IF THIS WORLD ISN'T GOING TO LOVE ME, THEN I'LL TEACH IT TO FEAR ME INSTEAD!!!!

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Are you talking about A Sweetie in Dreamland?

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Well I was Trying to avoid spoilers but yes.

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I editted the chapters, and read it.

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Sweetie Belle but with Miles Morales' powers

7460350 Not to blow in my own horn, but Sweetie Belle gains some major upgrade to her magical power in my novel.

TSweetie Belle Gains a Soul

• MLP: FiM
• Adventure
• Drama
• Slice of Life

In her darkest hour, Sweetie Belle finds salvation, but it comes with a terrible curse.

• Twilight
• Rarity
• Sweetie Belle
• CMCs

Bad Dragon · 132k words  ·  178  45 · 6.7k views

At one point, she pushes against the whole of Equus.

I planned to do a basic levitation, but with one difference. The earth wouldn’t be the anchor point; I would take that role by levitating the whole Equus against myself.

from a little loopy sweetie becomes equal to discord as well as strong enough to literally condense the sun into a black hole!

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There is no Sweetie Belle, only Thrackerzod.

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There are many candidates to be found in The League of Sweetie Belles (see here for a list if you don't mind spoilers). I'd say the most powerful is probably Suzie, although only due to a special ability she has that's generally too cataclysmic to use.