Victini ends up in Equestria after a little bout between Dialga and Palkia starts causing temporal disturbances throughout the world. Now, in a new world with his powers of victory, it appears that everyone wants to get their dirty hooves on him.
After examining every major events throughout the history of Equestria. Twilight accidentally stumbles upon a single underlying fact about them. There appears to be an unknown creature of alien origin present at each and every one of them.