Prologue
Disclaimer! I do not own pokemon or any of the characters except for their emotions and actions!
A very long time ago, as the world was being created, there lived a Sylveon by the name of Syl. Syl lived among the creators, Dialga, Palkia, Giratina, and Arceus in a small new realm called Kami No Roiki. While they created time, space, distortion, and all living things, Syl worked on the science. Day and night, she would work in her lab creating diseases and cures to help Arceus with the idea of a New World. The New World as he put it was a paradise of creatures like the ones they are, ideally with many races and species alike. The lab was full of handwritten books that consisted of cures and medical spells. She was a genius.
One day, a tragic incident occurred. While Syl worked on some of her potions, the project exploded, leaving everything she worked on destroyed, and her missing. She was never to be seen again. The creators were depressed, their beautiful sylveon has vanished into nothing, and no matter how much they tried to get her back, nothing worked, even for the creators, but instead, everything went wrong.
Giratina, the lord of hell and chaos, loved that Sylveon and never got to tell her how he felt but after the incident, he became cold and evil. The world then gained fear, death, evil, and impurity. If he couldn't have Syl anymore, then the new world would not be able to have a happy life.
On the other hand, Arceus had fought with Giratina saying that it was wrong, although they lost a fellow member, they cannot destroy all they have worked towards. No matter the situation, they cannot harm the new creations. Giratina was furious at Arceus' claim, he just lost his loved one and all Arceus dreams about is his "new world" and with that, Giratina left to his creation, a gift he once made for Syl, The Nightmare Zone. The Nightmare Zone was the evil realm that Giratina lived in. He fled there, never wanting to see the other creators again.