This is a parody and a joke.

Music Notes, Scooter Wheels, ad cutie mark crusaders' quest map, these were the ingredients chosen to creat the perfect little filly. But Luaren Faust added an extra ingredient, PowerPuff Girls refrence. Thus the cmc were born, using thier quest map, Sweetie Belle, Scootaloo and Apple Blossom lived thier live to finding thier and other ponies' cutie marks.