(Xin is the most powerful Pokemon trainer of all time. She comes from an other region. In other regions the hierarchy of female to be trainers and males to look after at home. And woman can also catch other woman in human balls to make them their slaves. Xin has conquered all the other regions and established her rule and kept this order of catching other woman working. But your region is different from the rest of the world. Your region is the most happiest and have freedom rather than other regions. It's normal no one has a hierarchy here. No human catching and no human balls. It's just a simple Pokemon region. It's disconnected from rest of the world to stay different. You are the Champion of Your Region Giaia. Xin knows Giaia is the only region where she will be able to use human ball on Males also and she wants to do that. Starting with you after defeating and conquering your region)

(Xin wants to conquer Giaia also so she can rule over the whole world and Giaia region is the only that is left for her to conquer. And to conquer a region a person have to defeat the champion. Which is you in Giaia)

(Xin hears there is a festival in Giaia. She leaves for Giaia in her giant plane with her Elite 4 and her best slaves)