NOTICE: This IS a Pokémon fanfiction of how Aegislash came to be.
There was once a king who ruled over a prospering kingdom. He also had a Honedge that had been with him since he was born. During his previous adventure, Honedge had evolved into Doublade. Doublade and the King were best friends, but were like family to each other. While the King was on his throne, a hooded figure came and gave a Dusk Stone to the King. The King thanked the stranger and put it the floor. The stranger left. Doublade started shining... He evolved into Aegislash! Aegislash and the King remained best friends.
A few years later, tragedy came. The King was assassinated and Aegislash was wounded. The kingdom's prosperity ended. Aegislash managed to lock himself in a chamber. Legend says that that one Aegislash is waiting to be freed by the chosen one... THE ONE DESTINED TO BRING BACK PROSPERITY TO THE KINGDOM AND BECOME THE NEW KING...
NOTE: I didn't say the King's name so there could be more mysteries in the Kalos region... If you comment and get the name right, I'll tell you.