The mane 6 is known for being a powerful part of the pony world. But what if that never happened? That's what happens when the mane 6 investigate a strange pony with and white tracksuit and clear white sunglasses. The pony dropped a so called "Artifact" as he called it, and with it the mane 6 has been able to travel in time, but even more powerful then normal spells. But they soon realize that this Artifact has a bit of a catch that is too large to ignore. The things they do, either in the future, or past, is now leaping into their time.
Happens after the villains are defeated in season nine episode 25.