What are some interesting plot ideas for a Pokemon Champion League fanfiction?

One idea could be a trainer with an underdog Pokémon that has a unique ability not fully understood yet. They face many challenges in the Kalos League but gradually learn to harness that ability to surprise opponents. For example, a trainer with a Skitty that has a hidden psychic ability.

One idea could be a new trainer who has an unusual Pokemon partner, like a shiny Pokemon with a unique ability, and they enter the Champions League. Their journey through the league is filled with unexpected battles and they have to learn new strategies on the fly.

One idea could be a story about an underdog trainer who enters the Master League with a team of rare but not-so -popular Pokemon. They face all kinds of challenges and discrimination from other trainers who have more common and 'powerful' Pokemon. But through their unique bond with their team, they start to surprise everyone and make it far in the league.

Another plot idea is to have a story centered around a Pokemon that has been misjudged in the Indigo League. Maybe it's a dark - type Pokemon that everyone assumes is evil. But the main character, a trainer, sees its potential and trains it to become a champion - level Pokemon. The trainer has to overcome the stigma associated with the Pokemon type and prove that it can be just as strong and noble as any other Pokemon.

Ash could encounter a legendary Pokemon in the Unova League that decides to help him in his battles. This would be a huge advantage and also a great plot twist.

One plot idea could be that a powerful Pokemon is corrupted by an Infinity Stone - like object. The Avengers, who are familiar with the power of the Stones, team up with the Pokemon Champions to purify the Pokemon. The Champions know how to communicate with Pokemon on a deeper level, which helps in the process.

One idea could be Ash facing off against old rivals who are jealous of his new Kalos champion status. They challenge him in unique battles that test his skills in new ways.

One idea could be Percy facing a moral dilemma where the will of the Primordials conflicts with his own sense of justice. Another could be him forming an unexpected alliance with a primordial being to save the world from a greater threat.

One idea could be Ash facing a new, extremely powerful and mysterious Pokémon in the Kalos region that no one has ever seen before. This Pokémon could be the key to a hidden power within the Kalos champion title. Another plot could involve Ash having to team up with a former rival from his past travels to overcome a threat to the Kalos Pokémon ecosystem. Maybe there's a dark organization trying to disrupt the balance, and Ash's unique bond with his Pokémon is what's needed to stop them.

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.