Just had it all figured out.....
When Nightmare Moon was banished to the moon, not all of her darkmagic followed. Some of it stayed, gathering the power of the moon,the stars,the earth and all the plants and animals(including ponies). The wind and air, however, did not give up its power/magic. Instead, it lead the dark magic, and the power it gathered, to the Tree of Harmony. The magic in the tree shaped it to a more manageable form,a pony, a unicorn to be exact. The little colt/foal was soon found and enrolled to Celestia's school.
His cutie mark, a quill on a crescent moon next to a star, was a puzzling tale. He, given the name Al, was able to know what a pony's special talent was upon first glance and understand why it special.
A misunderstanding had led to Al running away. He wandered Equastria. On the night Nightmare Moon returned, and was defeated by the Elements of Harmony, he was drawn back to the Tree of Harmony. The rest of Nightmare's dark magic, and the magic of the air, gave Al wings, making him an Alicorn,
Al eventually wound up in Quillamare, a remote little city a train ride away from Manehatten. He gave himself the name "Star Echo" for his connevtion to the stars.