Pegasus and her superpowers...

If I had a super power for one day, I think it would be psychokinesis.

Psychokinesis or telekinesis is a psychic ability allowing a person to move things without any physical interaction (for example, in the Marvel universe Jean Grey has a supremely high power-level of telekinesis).

 With it, first, I'd do some things I do everyday but staying on my bed and moving things with my powers, because I'm curious to know how it feels to do that in a different way, like bringing food, drink, and a lot of heavy things like books without any problems. Like that, I could spend my time resting and doing things I love. I would also try to paint or draw without my body, to see if I can manage to do something good with my psychic skills only or not. It could be funny !

Then, I'd play pranks on people I know, like stealing their stuff while I'm talking with them and when they'd realize that something is missing, put it back in place to make them believe it was an hallucination.

After that, I'd use my skills to make people and even myself levitate and fly, it seems  awesome to fly without being in a plane. 

I'd like to see my city from the sky, at night for example. I'm sure it looks beautiful with the lights everywhere.

And finally, I'd help people even if I guess that in one day only I wouldn't have time to do a lot of things, I think my help would be useful for some people.

With my powers I would help people carry heavy things like their cardboard boxes if they are moving for example. I'd save some animals like cats stuck in trees.

I would make toys move to make children laugh, in hospitals, and maybe realize their dreams if I can.

And, more impressive, I'd use my abilities to create shields, to protect people or myself if there is a fight or something like that. 

I would also intervene if there is a fire, because I would help the people to escape, protecting them with a shield and moving burning things to go out. 

If there was a flood I would save people and their objects and animals by pushing the water to create a way until they are in a safe place.