Pinkie Pie isn't the only pony to do this move even though she's famous for it. There are some more ponies who had learned the same thing. During the song called "Smile", the ponies, like Lyra Heartstrings for example, follow Pinkie on the rooftops. Rarity was so delighted to have her fire ruby and Ms. Peachbottom was entering the Crystal Empire with Pinkie. The recent thing I've seen is Party Favor, Sugar Belle and Double Diamond going across the bridge the blue unicorn has made. When doing the Pinkie Jump, ponies use all their legs with the tips of their hooves. If you are a human, you can do the same with two feet. I think I was the first one to do so.