I've seen this idea done before, but as a fan of Sonic and MLP: FiM, I wanted to give it a go myself.

This, basically, is the story of Sonic Generations, but crossed over with the MLP:FiM universe, with Spike and the Main Six taking the place of Classic Sonic and Classic Tails with other MLP characters also appearing (most aren't listed to prevent spoilers). Except for Green Hill, there will be different areas explored, as well as pony rivals and different era bosses. So while it will have its similarities to the console and 3DS versions of the actual game, it will definitely have its differences too.

Also, in case anyone was wondering, there will NOT be any shipping in this story. At the very least, no crossover shippings. No SonicxRD, TailsxTwilight, TailsxFluttershy, or anything like that. If there is any shipping at all, it will only be between characters from the same universe. And the only humans in this story are Dr. Eggman and the ones that appear in the "Sonic Unleashed" level.

A big thanks goes to bvge on Deviantart for creating the new logo on the cover art. It's a vast improvement over the old cover art.

The TV Tropes page can be found here.

NOTE: Due to the length of many of the chapters in this story, most of them have been broken up into smaller parts of roughly 10,000 words or less to make the story easier to read.

(Gravity Falls crossover) Discord and Bill Cipher where once partners in chaos. Traversing across dimensions, having fun while leaving a trail of absolute disorder and mayhem in their wake. Over 1000 years have passed, Bill has noticed a change in Discord, and is curious to know what has happened since then. He also never forgot about that old bet they had once made. Perhaps he can use the source of Discord's change to his advantage? But Discord knows Bill far too well, and he won't let him have his way...

That's right, the Joker, otherwise known as the Clown Prince of Crime, the Harlequin of Hate, and the White Duke of Death, is now in Equestria. Will this unpredictable, murderous psychopath learn the true magic of friendship and abandon his old malicious ways? Or will his arrival kick off an unstoppable crime spree to shape Equestria into his own image? Like I said, the Joker is unpredictable.

Special thanks to my awesome prereaders X19, LDSocrates and The Alpha, who are the best of the best! Read their stuff or just thank them for reading my unedited monstrosity before I release it to you guys!

Now on TV Tropes because of the greatness that is Shadow Sora94. Give him some thanks!