Simply a Crossover between Phineas and Ferb and My Little Pony.
Nope, not telling anything about the storyline here.
Well, except for one thing: This story is definetely playing before "Keep calm and flutter on" and Princess Twilight.
It is a little bit older anyway, from a time where I wasn't so far into MLP, so bear with any bad characteristics of the ponies in this story.

Another story about Rainbow Dash, Scootaloo and Scootaloo's wings. But because of a friendly bet gone wrong, Rainbow Dash and Scootaloo are being separated, and Scootaloo has to follow a new 'idol'. Who it is, you ask? Find out yourself, along with the answer to the question: Will Rainbow Dash and Scootaloo be able to fix everything?