I bet the whole MLP generation 4 will end something like this...
Twilight Sparkle and her friends are facing one of their greatest foes yet. Wonderbolts help control the foe while Rarity makes dresses for some reason. Applejack will use her brawn and Twilight will use her brain. Fluttershy will use animals somehow and Pinkie will just be Pinkie. Somehow, all of the background characters will have a role at some point. They somehow find themselves in the Everfree forest and they find a relic that transforms everyone into an Alicorn Princess.
Rarity would be the Princess of Dresses, Fluttershy will be the Princess of Animals; Pinkie would be the Princess of Parties; Applejack, Princess of Apples; finally, Rainbow Dash would be the Princess of Awesomeness.
They'll all use their newfound Alicorn powers to defeat the enemy.