There could be a secret organization that believes the chosen one's power will disrupt the balance they have carefully maintained in the Pokemon world. They would be villains as they try to eliminate the chosen one and the Pokemon helping them, thinking they are doing what's best for the world but in a very wrong way.
Maybe the chosen one has to solve a mystery that threatens the Pokemon world. The Pokemon use their different types of skills like water - type Pokemon using their ability to explore underwater areas to find clues. Fire - type Pokemon can keep the chosen one warm in cold and dangerous places while they search for answers.
Ash as the Chosen One in Pokemon fanfiction is a really interesting concept. It gives a whole new layer to his character. He could be given a special Pokemon by some mysterious force that is crucial for his destiny. This Pokemon might be one that no one has ever seen before. His friends would also play different roles, perhaps as protectors or guides to help him fulfill his chosen - one duties. And his battles would become even more epic as he has this greater responsibility on his shoulders.
I'm not sure specifically as there could be many different takes on it. Generally, it might be about Ash being some sort of chosen one in the Pokémon world. Maybe he has a special destiny, like being the only one who can stop an evil force or unlock a powerful Pokémon's true potential.
One common theme is the power of destiny. The chosen one is often fated to do great things, like saving the Pokemon world or bringing peace. Another theme is self - discovery. As they go on their journey, the chosen one realizes their own strengths and weaknesses.
The Chosen One is, of course, the main character. They are usually a young trainer with a big heart and a strong sense of justice. There are also often wise mentors, like an old Pokemon Professor or a retired champion who guide the Chosen One.
The Chosen One is obviously a main character. They are the central figure around which the story revolves. Their personality could be that of a brave and determined trainer, always ready to face challenges.
Ash is definitely one of the main characters since it's about him being the chosen one. His Pokémon partners like Pikachu are also likely to be main characters as they would be involved in his journey as the chosen one.
Power and responsibility is also a prevalent theme. With their special status as the chosen one, they have great power, such as being able to access rare Pokemon or having unique battle strategies. But they also have the responsibility to use this power for good, to protect the Pokemon world from threats like evil organizations or powerful, rogue Pokemon.
Typically, the main characters would be the chosen one and their roommate. The chosen one is likely to be someone with a special connection to Pokemon, perhaps having a unique ability or being prophesied to do great things in the Pokemon universe.