Singularity

Singulartiy, apart from Anti-Matter abilities she has time travel and she can exist outside of the Universe.

Forget to mention,😅 Time Travel is not allowed.

Then it's a tie but I'm not sure.

Singularity, as Antimatter has never really managed to do her any form of harm, or give her pause. She has actually managed to disperse him.

Plus, she kind of created him.

Singularity, as explained by Doc