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.
To develop Mars further, explore her softer side. Maybe she has a love for a particular type of Pokemon that she keeps hidden because it doesn't fit her tough - girl image. For Saturn, you could show his insecurities more. He always seems so confident, but what if there's a task or a Pokemon that makes him doubt himself?
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, 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.
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, 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.
To develop their characters further, you could show more of their backstories. For example, why they joined Team Rocket in the first place. Was it for power, money, or some other reason? Revealing this could add depth to their characters.
May's character could be developed further by having her encounter different types of Pokémon trainers from different regions. This would expose her to new training techniques and philosophies, which she could then use to influence Maxie. Maxie could be developed by having him interact with Pokémon in a non - Team Magma - related way. For example, he could rescue a Pokémon in distress and realize that there's more to Pokémon than just power and resources. Their relationship could also be developed in a way that they start to understand each other's languages. May could learn the jargon of Team Magma and Maxie could start to understand the trainer's language. This would bridge the gap between their two worlds and develop their characters.
Ethan could be developed further by having him face a big setback in his Pokemon journey, like losing a major battle. This makes him re - evaluate his training methods and bond with his Pokemon on a deeper level. Clair, on the other hand, could be put in a situation where she has to rely on others, which would show her learning to trust and work with a team better. This would add more depth to both of their characters in the fanfiction.
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.
For Paul, his character could be developed by showing his softer side. Maybe he has a Pokemon that gets seriously injured during a battle. This makes him realize the importance of not just winning but also taking care of his Pokemon's well - being. Zoey could be developed by putting her in a situation where she has to make a tough decision about her Pokemon's future, like whether to let it evolve or not. This would show her growth in terms of understanding her Pokemon on a deeper level.