This thing is years old, but I figured I’d give my input anyhow.
 
Superman’s most critical weakness is a weakness to magic. He is outright vulnerable to it. Celestia, being an alicorn, has the magic enhanced strength of the earth ponies, which means her punches and kicks would literally be magical in nature, somewhat evening the gap in theory. Her wings have pegasus magic, and her blasts that aren’t solar powered are outright magical power, which means she can hurt Superman which pretty much her whole arsenal.
 
The problem is twofold. Superman is way, way too fast for her. Even if landing any kind of hit could theoretically hurt him regardless of how much power he has, he just has to whip around behind her and punch her, like, once, which is the second part, she’s pretty frail compared to characters outside the mlp universe. I think she could catch Superman off guard, hold him for probably several minutes actually, but she definitely would not win.
 
Then again, they’d probably just become best friends anyways, so…

Wait. If Superman is vulnerable to magic, does that mean he is therefore vulnerable to friendship?

Don’t forget, Superman absorbs sun powers, so most of Celly’s sun-based magic won’t hurt him at all.

Batman…

@Coolpichu  
Yep, Goku isn’t evil, he’s STUPID. You know, “let’s see how cool his ultimate strength form is” stupid. He lives for the fight, so he takes unnecessary risks (a defect he shares with Vegeta).  
Of course, he’s not Luffy-class stupid (“Hey, let’s ask the Ultimate Evil to join our crew” level of stupid), but almost.  
I always wondered what’s with the Japanese and making anime main characters with an IQ comparable to Spongebob Squarepants…

Disregarding fanon, Celestia has never done anything to make me think she could stand a chance in an outright fight with Superman. She might pull off a Batman-strategy though. Direct fighting isn’t her style. (See: NMM, Discord, getting ass handed to her by Chrysalis)
 
@FlutterLove  
I don’t even know how to respond to your post, it’s so wrong. Goku loves a good fight, yes, but that hardly makes him evil.

Honestly, Celestia would win due to a small fault in Superman’s powers: a particular frequency of solar radiation drops his powers to nil (that’s why the Kryptonians were powerless, by the way). If Celestia replicates that frequency, Supes is just plain average joe against a lady that can toss mountains with her horn.

In truth they probably go hang out and fly to the caste

Wait, that’s not Superman…  
 
LIFE IN GOOD!

Coming back from the dead is a standard power for comic book superheroes. Superman has also done it. In fact, it’s usually quicker to list characters who haven’t…

Celestia would be the better superheroe if she wasn’t a leader of a nation.  
Her powers: She is God, suck it Supes.  
Really though a demi-goddess that controls the Sun unleashing her full-power would annihilate Superman.  
But we all know that Captain America would win just by the fact his shield can withstand anything and he can come back from the dead.

As others have pointed out, Superman is pretty much helpless against magic. He would be Celestia’s bitch if it came down to a fight.

Magic is one of the few things Superman is vulnerable to. It’s why Mr. Mxyztplk is such a problem.

@lunafan22
 
That’s not how you spell The Tick.

@ Flutterlove
 
No, Goku isn’t the most evil person in DB. Not even close. Frieza, for example, is a genocidal madman whose destroyed at least two races and the planets they lived on because he was bored.

goku wins

Well Batman hasn’t completely “beaten” Superman, but he does a heck of a job for a regular human being!

@Trickquestion-BUT WHAT ABOUT THE JOKER’S BONER!?!?
 
Batman is also a viable option as he’s dealt with the Joker and has beaten Superman!

Batman doesn’t generally win so much as survive. He needs massive amounts of preparation to hang on long enough to get Superman to stop fighting.
 
Even then, Batman is acknowledging that Superman could atomize instantly if he wasn’t such a nice guy.
 
There’s a reason that a lot of Batman’s plans involve having someone else face Superman, and that’s because he’s too smart to willingly go head-to-head with someone as powerful as Superman.

@Flutter
 
And Ron is a death eater apparently. Yes he’s does like a good match now and again, but he wouldn’t risk the lives of anyone to do it, andhe does act with the greater picture in mind and does want what’s best for it, also Goku isn’t very bright.
 
@Quickfix
 
Eh, fair enough.

Well if the comics are anything to go by, Superman is the greatest supervillain/hero and the strongest/weakest here, all at the same time.

Well, way I see it, Celestia would be trying to kill Lex Luthor, becuase Luthor stole fourty of Celestia’s cakes (which is terrible). Superman would try and keep Luthor alive, becuase you can’t kill someone without a trial and blah blah blah.
 
They knock each other around for a solid hour before getting Chinese food.

Goku isnt a pillar of goodness he is just a violent person, he only cares about the fights, he might be the evilest person in the DB universe

Why would they fight in the first place? I’d sooner think she’d ask him out.