In Equestria, legend tells of a pony, all the colors of the rainbow, who will grant the wish of a pony whose heart is true. But tread lightly—the Rainbow Pony will grant a wish only if the wisher completes a unique task.
Rainbow Dash's 1st Person Perspective in how she views herself as a friend and pony to the others in Ponyville. (A connection between myself in how I dealt with my unsettled self when I was young)
Throughout her life Rainbow has dealt with most every threat imaginable, but the loss of her father? It hit her the hardest....this story is her grievance for it.