Dawn could develop by becoming more confident in her battle skills. Ash could encourage her to enter more battles outside of contests. They could train together, and Ash could share his battle strategies. This would also make their relationship more complex as they learn from each other.
To develop their characters further, Ash could be shown learning more about Pokemon contests from Dawn. This would add a new dimension to his character. Dawn, on the other hand, could learn more about Ash's battle strategies and apply them in her own battles. They could also face some moral dilemmas together, which would show their growth in character.
For Dawn, you could develop her character by having her face a major setback in her Pokemon training journey. This could make her more determined and resourceful. As for Saturn, showing his backstory more, like his reasons for joining Team Galactic in the first place, could add depth. Maybe he had a difficult childhood and saw Team Galactic as a way to gain power and respect.
For Dawn, she could be developed by showing her struggle with a new and difficult Pokemon training technique. Ursula could be involved by initially mocking her but then later helping her out. This would show a softer side of Ursula. Dawn could also learn from Ursula's confidence in her own abilities and become more assertive in battles. For Ursula, she could be developed by having her face a loss against a tough opponent and then seeing how Dawn copes with defeat. This could make Ursula more humble.
To develop their characters further, a fanfiction could put them in a situation where they have to save a group of endangered Pokemon. Ash's impulsive nature and Burgundy's more calculated approach could either clash or complement each other. Through this experience, they both learn to adapt and grow. Ash might become more patient, and Burgundy might become more open - minded, which would enhance their individual characters and their relationship.
For Ash, his character could be developed further by showing his growth in understanding different Pokemon cultures. With Molly, he could learn new ways of interacting with Pokemon that are different from what he's used to. For example, if Molly has a closer bond with water - type Pokemon due to her origin, Ash could learn from her how to better communicate with them.
Greta could be developed by exploring her backstory more. Maybe she has a special reason for being so passionate about fighting - type Pokemon. Also, her interactions with Ash could lead to her becoming more open - minded about other Pokemon types. She might start to incorporate different strategies that Ash uses into her own battling style.
One way to develop their characters further is through a story arc where they are separated from their Pokemon for a while. Ash, who is so used to having his Pokemon by his side, would have to rely on his own wits and survival skills. He might discover new strengths within himself. Lily, too, would be in a similar situation. When they reunite, they could share their experiences and have a newfound respect for each other. Also, they could get involved in a diplomatic mission in the Pokemon world, representing different regions. This would require them to be more diplomatic and understanding of different cultures, which would add new layers to their characters.
For Ash, he could be developed further by showing his growth in understanding the more delicate and nurturing aspects of Pokemon care from Erika. Maybe he starts to learn about different types of Pokemon food and habitats that Erika is an expert in. For Erika, she could be shown to become more adventurous like Ash, willing to step out of her comfort zone of her garden. For example, she could join Ash on one of his more daring quests.
For Ash, he could develop further by learning some of Domino's more strategic ways of battling. This would make him a more well - rounded trainer. Domino, on the other hand, could learn from Ash's unwavering determination and bond with his Pokemon.
For Ash, his character could be developed further by showing his growth in understanding different Pokemon cultures. Hapu could help with that as she has deep knowledge of her own region's Pokemon. For example, Ash could learn about unique training methods from Hapu.