What should have happened in the season finale
"Princess Cadence and Shining Armor, it is my great pleasure to pronounce you-"
"STOOOOOOP!!!" The purple unicorn yelled as she burst through the door. Her friends face hoofed in embarrassment.
"Ugh! Why does she have to be so possessive of her brother?!" the fake Cadence said, then realizing what she just did, correcting her self she said with fake tears, "Why does she have to ruin my special day?"
"Because it's not your special day. It's mine" said the real Cadence as she came through the door. All the ponies gasped at the sight of two Cadences.
"What? But how did you escape my bride's maids?!" the fake Cadence angrily said. Twilight and Cadence looked at each other. They simply through a bouquet of flowers and they all chased after it yelling, "I WANT IT!!"
"Humf, clever. But you're still too late!" the fake Cadence replied.
"I- I don' understand? How can there be two of 'em?" the confused Applejack asked.
"She's a changeling! She takes the form of somepony you love and gains power by feeding off your love for them" Cadence yelled. At this, the fake Cadence reveled her true form surrounded by green fire and became Queen Chrysalis of the Changelings. All the ponies gasped in awe. Chrysalis gave an evil laugh.
"Right you are, Princess. And as queen of the changelings it is up to me to find food for my subjects! Equestria has more love than any other place I've ever encountered. My fellow changelings will be able to devour so much of it that we will gain more power than we have ever dreamed of!"
"They'll never get the chance!" Princess Cadence rebuked Chrysalis, "Shining Armor's protection
"No. You won't." Celestia said as she came from behind Chrysalis, "You may have made it impossible for Shining Armor to preform his spell, but now that you have so foolishly relieved your true self I can protect my subjects from YOU!" then the Princess flew up in the air and shot a blast of yellow magic from her horn at Chrysalis. Chrysalis then shot back with green magic. After a few seconds of Celestia being stronger, Chrysalis's green magic began to overpower Celestia's. Right as Celestia thought all hope was lost and the evil magic was about to send her flying, Princess Luna came breaking through the glass and shot a dark blue magic blast at Chrysalis's magic. The two sisters blasting together destroyed Chrysalis's magic, and Chrysalis was never seen again.
-THE END