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.
Then there might be an antagonist. This could be a power - hungry trainer or a group that wants to use the Chosen One's power for their own evil purposes. They constantly try to thwart the Chosen One's plans and create obstacles in their path.
There could also be a mentor figure. This might be an experienced Pokemon trainer or a wise old Pokemon. The mentor helps the Chosen One understand their powers and guides them on their journey. For example, they could teach the Chosen One special battle techniques or how to communicate better with Pokemon.