Why does anyone keep a journal? Do they need to record the events of their lives, lest they forget? Is it merely a formality? Or is it so they have someone to talk to?
Many years ago, shortly before the birth of one Twilight Sparkle, Celestia, ruler of Equestria, found a small item in a forest. That item? An egg. Around the same time, Celestia, ruler of Draconica found something small in a forest. A pony.