Princess Pinkie

After Pinkie Pie saw Twilight become an alicorn, she got jealous and went back in time, thinking, "How can I become an alicorn instead of Twilight?"

First she went back to the basics.

"All right. My element is laughter. It's right there in my cutie mark!" Pinkie Pie pursed her hooves. "If I'm going to become an alicorn, I have to focus on achieving the true meaning of my cutie mark."

She moved some rocks around on a table, examining the arrangement as if it were a chessboard.

"How do I achieve the true meaning of laughter?"

Pinkie Pie thought about this question, and ate a few cupcakes. The evening faded into night, so she made some coffee. She was thinking harder than ever before.

After many sketches of plans had been made and discarded, she sighed and decided to review.

"So. What I know at this point is that I have to spread as much laughter as possible to as many ponies as possible. And that's... all I know."

Pinkie's head fell onto the table. She dragged herself, defeated, towards bed. "Maybe I'll figure it out in a dream..."

But as she was crawling into bed, a shout could be heard even from the lobby of Sugarcube Corner: "I'VE GOT IT!"

So Pinkie Pie created the Singularity.

First she had to create a post-scarcity economy. Then she had to perfect AI and bridge the gap between machines and the pony spirit.

It didn't take too long.

The Singularity, into which everypony started uploading their consciousnesses in order to live forever henceforth as electronic entities, created endless hyperrealistic virtual reality pleasure, which certainly made a lot of ponies laugh very hard for a long time.

Pinkie didn't become an alicorn IRL, but her hyperrealistic electronic avatar did.