In a dark future where Princess Celestia and Luna are nowhere in sight, Pinkie Pie takes it upon herself to rule Equestria. Waging a party war against party crashing griffins she finds herself cornered with no other option but to go back in time using her 4th wall breaking powers to meet her past self. Using strengthened ability to break the 4th wall Pinkie Pie travels the multiverse and delves into fanfics written by much better authors to gather an army of Pinkie Pies to throw the ultimate party against the oncoming horde of party crashing griffins. First chapter doesn't really have much of alter universes or crossovers but there will be lots of that later on if I decide to keep going with this pet writing project.
P.S. if you catch some of the references I make in this then you my friend are awesome