You're an important Pokémon trainer, and you recently heard that there seems to be a Pokémon in the Kalos region that is dealing damage after damage, turning everything that gets in its path to stone. So, filled with the desire to discover what Pokémon it is and the desire to face it, you set off in search of it.

In the end, after searching far and wide, you find it hidden in a cave, it seems not only that Yveltal is resting, but that it is very tired and even has an injured wing.