Perhaps the main antagonist could be a group of hackers who have infiltrated the Game of Champions system. They want to control the outcome of the battles for their own gain, whether it's to steal rare Pokemon or sell battle data. They create all sorts of obstacles for the legitimate trainers in the fanfic, like glitching the battle arenas or making false accusations against the heroes.
It could be an ex - champion who was stripped of his title due to some scandal. He blames the Pokemon league and decides to take revenge by disrupting the Game of Champions. He trains a team of extremely powerful and rare Pokemon that he uses to intimidate and defeat other trainers. He also spreads rumors and sows discord among the participants to create chaos in the competition.
The main antagonist could be a powerful trainer who has been banned from official Pokemon leagues for using underhanded tactics. In the Game of Champions, he sees an opportunity to regain his reputation and will stop at nothing to win. He uses his knowledge of Pokemon psychology to manipulate his opponents' Pokemon during battles.
A determined young trainer from a small town who has always dreamed of making it big in the Pokemon world could be a main character. He starts with a common Pokemon but through hard work and training, it becomes very powerful. Another could be a mysterious trainer who always wears a cloak and has a team of rare and powerful Pokemon that no one has ever seen before.
Maybe an underdog trainer who has been training in secret and decides to enter the 'champion of champions' competition to prove themselves. This character could have a unique bond with their Pokemon that gives them an edge in battles.
It could be an underdog character. Maybe a young boy or girl who has always dreamed of being a champion but lacks the natural talent. However, through hard work and determination, they start to make a name for themselves in the game.
The main character could be a young and fearless fighter named Kai. He has been training all his life for the 'game of champions' and has a natural talent for combat. He is determined to prove himself and win the championship.
A possible interesting plot could be that a new tournament, the Game of Champions, is announced in the Pokemon world. Trainers from all regions gather, each with a unique set of Pokemon and strategies. The main character, a young and ambitious trainer, has to face off against powerful opponents, including some well - known gym leaders and elite four members. Along the way, they discover a new type of Pokemon evolution that gives them an edge in the competition.
An organization of rogue scientists who want to experiment on Pokemon could be the main antagonist. They might be trying to create super - powerful mutant Pokemon or find a way to control all Pokemon. If you're reborn as a Pokemon, they might capture you for their experiments. This could lead to a story where you have to escape from their labs and expose their evil plans to the rest of the Pokemon world.
In addition to the well - known champions, there could be some new or lesser - known champions. Maybe a champion from a newly discovered region that has unique Pokemon. They would bring in a fresh perspective and different training methods. Also, some retired champions might come back to help the current ones. They could have a wealth of experience and wisdom that the younger champions lack. These characters would all interact, share their stories, and work together towards a common goal in the fanfic.
It could be the trainers who have the strongest Pokémon. For example, a young and determined trainer who has been training hard for the championship.
A new, mysterious organization that is interested in controlling the legendary Pokémon. They see Latias as a key to their plan and Ash as an obstacle to be removed.
A powerful and corrupt Pokemon trainer who wants to use rare Pokemon for his own evil plans could be a great antagonist. He might try to steal Pokemon from Wes and Rui or stop them from achieving their goals.