Amazing cover made by @Noble_Royalty
After Ash finally wins the Kalos League Serena decides to tell Ash how she feels about him but then she sees him kissing Miette. After seeing that it left Serena completely heartbroken and caused her to fall into depression. Then shortly after Serena's mother died in a house fire leaving Serena homeless living on the streets of Lumious. All of her Pokemon were stolen except for her Sylveon which stayed outside of its Pokeball. After six months Serena witnesses a brutal murder commutes by a famous serial killer called the heartbreaker because he's known stabbing in the hearts with his has axe. then Looker helps Serena get adopted and she is sent to Kanto for safety. After settling in with new family Serena runs into none other than Ash Ketchum but Serena's not safe. Even though she fled to Kanto the killer wants Serena dead even if it means killing those who get in his way to do so.