(I'm going to timeskip the training part, since it's going to take forever to get to the main story)
Later that day, after the training was over, Orianna decided to do some exploration in the Mystic Forest all by herself. It was still peace during sunset. However, as she goes deep into the forest, she sees something glowing in the distance. As she gets closer and closer, she notice the trees and plants around a 15 feet radius died out. Then she find out what it is, an orange crystal stones planted in the ground, these are known as "Shadow Stones."
[video=youtube]https://www.youtube.com/watch?v=09Etlfc8w0M[/video]
"That's strange, I thought these stones are guarded by Suicune, Aurorus, and Diancie to make sure no one takes them out of the caverns, where it's a perfect place for these type of crystals, and used them for evil purposes."