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.
Perhaps a story where a dark force is threatening the Pokemon world again, and the only way to stop it is for all the legendary Pokemon to reunite. Trainers from all over have to find and convince the legendary Pokemon to come together. Along the way, they meet old friends and rivals, and there are many emotional reunions between trainers and their Pokemon as they work towards this common goal.
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 idea could be that the original Glee club members reunite to put on a charity show. They face old rivalries resurfacing but also rediscover their love for performing together. Maybe some of them have become big stars and some are still struggling, and they learn from each other's experiences.
One idea could be the main character being reborn as a Pikachu and having to navigate the world with its electric powers while making friends with other pokemon. Another could be being reborn as a Eevee and having the unique ability to evolve into any form at will, which causes both envy and admiration among other pokemon. Maybe the reborn pokemon has memories of being a human and uses that knowledge to outwit trainers and other threats.
One idea could be that Hermione discovers long - lost relatives who are also powerful wizards or witches. Maybe they have unique magical abilities that Hermione has never seen before. They could gather for a reunion at a magical location, like an ancient family castle hidden in the Scottish Highlands.
One idea could be that Hermione attends a muggle high school reunion. She has to hide her magical abilities but accidentally uses magic when an old bully starts to harass her. Another could be she meets an old muggle friend who has a mysterious ailment, and she secretly uses magic to heal them while trying not to expose the wizarding world.
One idea could be that the boys reunite for a special charity concert. They each bring their own unique musical growth from their solo careers and blend it into a new sound for the concert. It could be a chance to heal old wounds and reignite their friendship on stage in front of their fans.
One idea could be that Harry returns from a long and dangerous mission. Ginny has been worried sick. When they reunite, there's an immediate rush of emotions. They hug tightly and Ginny scolds Harry a bit for making her worry, but it's all out of love. Another could be they reunite at Hogwarts during an anniversary event. They see each other across the Great Hall and slowly make their way towards one another, with memories of their school days flooding back.
A great plot for a Harry Potter reunion fanfiction could be centered around a magical competition among the old friends. They gather at Hogwarts for this event. There are different challenges that test not only their magical skills but also their friendships. For example, one challenge could be to face their greatest fears together, which would bring back a lot of memories from their school days. Along the way, there could be some romantic rekindlings, like Harry and Ginny reminiscing about their relationship and how it has grown over the years.
An interesting plot for a Pokemon Conquest fanfiction could be a tale of a trainer who loses their memory but still has an innate connection with their Pokemon. As they journey through the kingdoms, they slowly start to regain their memories through their Pokemon battles and interactions. Another plot could involve a forbidden love between trainers from rival kingdoms, and how they try to keep their relationship a secret while also dealing with the pressures of their kingdoms' expectations. You could also create a fanfiction where a new type of Pokemon emerges, and all the kingdoms are vying to be the first to tame and control it, leading to a series of intense battles and political intrigue.
One idea could be exploring an alternate universe where the protagonist starts with a rare and unique Pokémon that's not available as a starter in the original game. Another could be a story about a Pokémon trainer who has the ability to communicate with Pokémon in a more in - depth way than normal, and how that changes their journey in the Unova region. Maybe a fanfiction about a group of Pokémon trainers coming together to solve a mystery that threatens the balance of the Unova region.