Well, one possible plot could be that Ash finally realizes his true feelings for Misty during a big Pokémon battle. Maybe he sees how brave and supportive Misty is and decides right then to ask her out. They could then go on a date to a special Pokémon - themed place, like a garden full of Pokémon - friendly flowers.
A different plot could be that Ash is given a dare by his friends to ask Misty out. At first, he's hesitant, but as he thinks about it more, he realizes he actually wants to. Misty is initially shocked but then happily accepts. They start to explore new places together, learning more about each other outside of just being Pokémon trainers.
If Ash asks Misty out in the fanfic, their relationship would become more romantic. They would start to hold hands, hug more often, and be more affectionate in general. Their conversations would also become deeper, sharing their dreams and fears that they might not have shared before as just friends.
In some fanfics, Misty might be portrayed as betraying Ash for power. For example, if there is a powerful trainer who offers Misty a chance to become an even greater trainer, but at the cost of leaving Ash behind. She could be tempted by the allure of advanced training techniques or rare Pokémon that this new opportunity presents.
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.
The plot could be that Ash and Misty are invited to a black - and - white Pokémon expo. There, they see all kinds of unique Pokémon presentations. However, things take a turn when some Pokémon start acting strangely due to a mysterious force. Ash and Misty must figure out what's wrong and stop it, using their combined skills and knowledge.
It's doubtful that it's a popular fanfic. Popular fanfics usually tend to build on the positive aspects of the source material, like the friendship or adventure between characters. A concept where Ash kills Misty is so out of the ordinary and negative that it probably doesn't appeal to a wide audience. However, there might be a small niche of readers who are interested in very dark and alternative fanfics, but overall it's not likely to be popular.
One idea could be that Ash and Misty visit Unova for a Pokemon tournament. They meet new friends and face new challenges together. Misty could use her water - type Pokemon in creative ways against the Unova Pokemon's unique types.
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.
One possible reason is a difference in goals. Ash might be focused on one type of Pokémon journey, like competing in a particular league. Misty, on the other hand, could have a different long - term goal, like protecting a specific water - type Pokémon habitat. If their goals start to conflict, it could lead to a situation where Misty seems to betray Ash to further her own aims.
In this fanfic, Ash and Misty could be part of a special black - and - white Pokémon tournament. They team up, with Ash leading the battles and Misty providing strategic advice. Along the way, they meet new trainers and Pokémon. Their bond deepens as they work towards winning the tournament, and they learn more about the unique black - and - white Pokémon in this event.
One common theme is adventure. Since they are Pokémon trainers, many fanfics will have them going on new adventures together, facing powerful Pokémon and exploring new regions.