Well, a great plot might be that Ash and Misty are in Kalos on a research mission about Pokémon evolution. Misty is especially interested in how certain water - type Pokémon in Kalos evolve differently compared to other regions. They get separated during their exploration in a mysterious forest in Kalos. Ash has to find his way through the forest with his Pokémon while also looking for Misty. Meanwhile, Misty discovers an ancient water - type Pokémon that is thought to be extinct. In the end, they reunite and share their discoveries.
The plot could be that Ash is in Kalos to participate in a special Pokémon tournament. Misty hears about it and decides to come support him. Charizard, of course, is Ash's main battling Pokémon. Along the way, they meet a new type of Pokémon that is causing trouble in the region. They have to figure out a way to stop it, with Charizard using its powerful attacks. And in the end, Ash wins the tournament with the help of Misty and Charizard.
In Kalos, one potential rival for Ash could be a local trainer who specializes in Fairy - type Pokémon. Fairy - type Pokémon can be quite tricky in battles, and this trainer has mastered the use of their unique abilities. For Misty, a rival could be a girl who is an expert in water - type Pokémon battles, just like Misty herself. This girl might have some rare water - type Pokémon from Kalos that Misty has never seen before.
One common theme is adventure. Since Kalos is a new region for them, there are always new places to explore, Pokémon to discover, and challenges to overcome. For example, they might go on a journey to find a rare Pokémon in the Kalos wilderness.
Well, a fanfic about Ash, Misty and Charizard in Kalos could be really exciting. Maybe it could start with Ash arriving in Kalos with Charizard, and then Misty comes to visit. They could explore the unique Pokémon in Kalos together, and Charizard might have some interesting battles against the local strong Pokémon. It would be a great story to show their friendship and adventures in a new region.
Well, it could be about Ash exploring the new region of Kalos, meeting new Pokémon and trainers. Maybe he'll participate in the Kalos Pokémon League and face some tough opponents with his Pikachu and new Kalos Pokémon he catches along the way.
The plot could be that Ash enters a Kalos - only Pokémon competition with Charizard. They face strong opponents with unique Kalos Pokémon. Charizard might learn new moves by observing the local Pokémon. For example, it could see a Delphox use a powerful fire - type move and try to adapt it to its own style.
Well, it could be about Ash going back to Kalos to compete in some new Pokemon battles. Maybe he wants to challenge new trainers or participate in a special tournament there.
In an 'Ash Wins Kalos League' fanfiction, one possible plot could be that Ash finally masters his Mega Evolution techniques better than ever. He has a series of intense battles where he outsmarts his opponents. His bond with his Pokémon, especially Greninja, reaches new heights. They use their unique moves in creative ways to defeat strong adversaries and claim the victory in the Kalos League.
Well, it could be that Ash has trained with some rare and powerful Pokémon in the Kalos region that are not typically part of his main team. This new addition to his arsenal helps him win the league. Also, he could have received some secret training from a legendary Pokémon trainer in Kalos, which gives him the upper hand in all his battles.
Well, one possibility is that Ash continues his Pokemon training in Kalos, facing new and stronger opponents. Maybe he teams up with old friends from Kalos to take on a new threat to the region.