Silver Spoon was Diamond Tiara's best friend and the two tormented the CMC when they were blank flanks. The CMC went on many crusades to find their special talents, and when they found them?
They went on many more crusades to help other pony's find their special talents. As for Diamond Tiara and Silver Spoon? With the CMC's help Diamond Tiara rediscovered her special talent and worked to be a better pony. And Silver Spoon? She started fading into the background.
And Discord? Well he decided to be a good samaritan and send Silver Spoon off on her own pokemon adventure.