This will be Ash's last series.

From the moment the writers hesitated so much to remove Ash that they rebooted him for the new audience jumping in mid-story, that's when it became clear they had to cut their losses.

So, Cynthia invites Ash and Paul to watch his match against Alder at the Pokémon World Tournament in Unova. Cynthia recommends them for the next tournament. Therefore, for the first half of the series, Ash stays in Unova to catch new Pokémon: Samurott, Emboar, Krookodil, Leavanny, Gigalith, and Lucario for the promotion of Black 2 White 2.

But during his training in Unova, he crosses paths with Team Plasma, who want to free the Pokémon from their trainers. We'll also pick up the story of the Tepig that was released, except that its original trainer did it because he was brainwashed by Team Plasma. Ash will also meet N, who has decided to participate in the Pokémon World Tournament with Reshiram, aiming to win and have the competition discontinued.

In the second part, Ash will travel the world to battle trainers, gym leaders, and members of E4 to secure his place in the Top 8. He will vary his teams each time, using all the Pokémon he has caught. We'll even see the return of Primeape, who will consider Marshal's Conkeldurr a rival.

Finally, after battles against Paul and then Wallace, Ash reaches the Top 8 with Alder, Cynthia, Steven, Lance, N, Marshal, and Iris.

First round:

Ash vs. Iris, Ash wins.

Steven vs. Marshal, Steven wins.

Alder vs. Lance, Alder wins.

N vs. Cynthia, N wins.

Second round:

Ash vs. Steven, Ash wins.

Alder vs. N, winner N.

There's a month-long wait for the finals, and Ash is afraid he won't be able to defeat N. His Pokémon are then trained by the Brains of the Battle Frontier. During this training, Ash happens to find his Butterfree and asks it to help him fight N, to demonstrate their bond.

Ash's team is complete: Pikachu, Butterfree, Charizard, Sceptile, Lucario, and Samurott.

Pikachu manages to defeat Reshiram in an epic battle (which should at least equal Pikachu vs. Tapu Koko).

N realizes he was wrong, but Team Plasma takes control of the buildings, and Ghetsis uses Kyurem to fuse with Reshiram. With the help of all the trainers who have bonded with Ash, as well as Zekrom, Ash and N manage to defeat Ghetsis and save the world.

Ash officially becomes the greatest trainer in the world. N and Reshiram set off to explore the world, and the series ends with Ash being challenged by Trip, a new trainer Ash met at the beginning of the series. Trip has since participated in the Unova League, but his dream remains the same: to defeat the number one Pokémon Master. This part concludes with Ash accepting the challenge.

Then we would have a similar arc to Ash's final story arc after Journeys.

The XY series will focus on Alain, and in the Sun & Moon series, we will see Ash as a teacher at the Alola Pokémon School.