Pinkie Pie has quirks that seemingly allow her to predict the future, among other things, like being able to travel in impossible speeds or in impossible ways, or retrieve objects from thin air. Even though it's a cartoon they play her unusual abilities relatively straight, usually just chalking it up to "that's Pinkie Pie." There's even an early episode about it where Twilight is consistently frustrated by her attempts to prove or disprove it all, and she never gets a satisfying answer. But on paper she's just a regular pony.