I would recommend reading this, but you can skip, the story starts next chapter.
A few words before we begin-
1. Within the world of this story, PCs and sending Pokemon from one place to another through a computer do not exist. Pokemon are much closer to actual animals than the games portray. One does not download them onto a flash drive.
2. Ash Ketchum is somewhat of an enigma in that he never seems to age. Not in this story. Ash has aged as he would have had he started his journey at ten years old. Here are the approximate ages of the main characters in this story.
Clemont, Miette, Tierno- 17
Ash, Serena, Shauna, Sawyer- 16
Trevor- 15
Bonnie- 9
Professor Sycamore- None'a'yo business! (Kidding, he's 31.)
That should be enough for getting on with. As more characters are introduced, I'll try to remember to mention their ages.
3. While Pokemon are the superior means of combat and keeping the peace in this story, modern weaponry does exist. Law enforcement officers such as Officer Jenny carry modern handguns, but Organizations such as Team Flare use weapons that fire energy collected from a Pokemon's attack. Think Hyper Beam or Charge Beam, but a little smaller, coming from a gun. Kinda Star Wars, I know, but I think it makes sense. Law enforcement don't use these because of their greater potential for misuse and collateral damage. An ordinary firearm, or trained Pokemon, is much more precise.
4. Gambling on Pokemon battles is illegal. Holding an official tournament, where the pot goes to the winner, is legal. Technically.
5. This symbol here (-o-) means a shift in the story, time-line, or Point Of View. It's meant to look a little like a pokeball. I know it's a bit of a stretch, but I'm doin' my best.
6. I won't pretend that the events in the Pokemon movies didn't happen. However, the events that transpired were, for the most part, witnessed by few people, and Ash and friends kinda keep that stuff under wraps. Also, Ash has, over time, regained his memories of what happened with Mewtwo. Brock and Misty still don't remember. Whether Mewtwo meant to remove the mental block, or if it faded naturally, is a mystery.
7. Pokemon saying their names over and over again really gets on my nerves. It makes sense that Pokemon like Pikachu could have been named after the sounds they make, but Pokemon whose names clearly refer to their appearance or nature… it doesn't make even a little bit of sense. With the exception of Pikachu, and a few others, Pokemon will make the noises you would expect them to make. (Dragons roar, frogs croak, chandeliers make whatever noise you think a possessed chandelier would make.)
While we're here, let me give a more precise summary. This is essentially a How It Should Have Ended for the XY and XYZ anime. In this version of the story, Ash won the Kalos League, and not only that, but he beat out Diantha for the title of Kalos Champion. After mopping up Team Flare, there's the small question of… what now?
When you've seen everything Ash has, it's hard to be like everyone else. Ash decides to keep his history as a Pokemon trainer secret from his new friends, pretending that his journey began with Pikachu in Kalos. But it's only a matter of time until the Meowth's out of the bag.
Ash comes to the conclusion that his journey has come to an end. He brings his Kalos friends back to his home in Kanto. There are touching reunions, new friends meet old friends, and it seems peace has come to our heroes. Until Steven Stone and Alan make Ash an offer he has a hard time refusing…
This story will have a lot to do with the relationship between Ash and Serena, as well as what the future holds for Ash's friends as their childhood falls away. First half- friendship and fun. Second half- more hardcore battle and intrigue.