In a fanfiction about Ash's reunion in Alola, perhaps he comes back to help with an ecological problem. The Alola region's unique ecosystem is in danger, and his friends call him for his expertise. Ash brings along some of his other Pokemon from his travels, and together they work to save the day while also having a great time catching up.
Ash could discover a new form of an existing Alola Pokemon. This new form could be the result of some kind of special evolution due to the unique energy in the Alola region. His friends would be amazed, and they would all help him research and understand this new discovery.
Team Rocket could also be the focus of a reunion fanfiction. Maybe they've reformed and are having a reunion to celebrate their new lives away from their villainous ways. They could be showing off their new Pokemon or skills that they've developed.
A great plot could involve a Pokemon reunion where the Pokemon themselves organize the event without the trainers knowing. They set up all kinds of challenges and games for each other, and the trainers are left wondering what their Pokemon are up to. It could also be about a group of retired trainers who reunite and share stories of their adventures, and their Pokemon also have a sort of 'reunion' among themselves, showing off new skills they've learned over the years.
Gary Oak can be a great addition. He was Ash's rival and his growth and development over the series can add an interesting dynamic to the reunion. Also, Serena is quite popular to include. Her relationship with Ash and her own Pokemon journey make her a relevant character. And of course, the Gym Leaders from different regions can be brought together for the reunion, each with their own unique personalities and Pokemon.
Clearly, the main characters are Ash and Misty. Ash, the protagonist of the Pokémon anime series, has his own unique style of training and a big heart for Pokémon. Misty, with her fiery personality, was an important part of Ash's early adventures. In this fanfiction, their reunion will likely be a central focus, with their different personalities and experiences coming together again. It might also involve other characters from their past who could add more depth to the story of their reunion.
Well, they might have a friendly chat about their past adventures. Maybe they'll share stories of the Pokémon they caught and the battles they fought together.
One idea could be that the main characters reunite during a big Pokemon tournament. They each have new Pokemon and strategies, and they compete against each other in an epic battle. It could also be a reunion during a crisis, like a natural disaster in the Pokemon world, and they have to work together to save Pokemon and people.
One possibility is that they meet during a Pokemon contest. Dawn is excited to compete, and Ash is there to support her. Along the way, they encounter some rare Pokemon that neither of them has seen before. This leads to a joint adventure to learn more about this new Pokemon. Their friendship deepens as they work together, and Ash might even get some inspiration from Dawn's contest skills for his own battles.
The reunion of Ash in fanfiction can be a catalyst for many things. If he reunites with a character who has some hidden knowledge or power, it can open up new story arcs. For instance, if he meets an old sage who tells him about a secret Pokémon technique. Also, when he reunites with a Pokémon he thought was lost forever, it can bring back memories and emotions that were buried. This can lead to Ash making different decisions in the story, like choosing a different path in his journey or changing his training methods.