The Story

Rainbow Dash works in the Rainbow Factory, where failed pegasi are taken to be drained of their color. When Rainbow Dash realizes Scootaloo was going to take the test soon, she knew she had to do something to save the flightless pony from her horrible fate. She thought and thought, but what could she do? That's right, turn Scootaloo into an Earth Pony.

This is based on Rainbow Factory by Aurora Dawn