He would probably become more introspective. Usually, Ash is quite action - oriented. However, in this fanfiction scenario where he's involved with Legendary Pokemon, he would start to question his place in the world, his purpose, and his relationship with Pokemon on a deeper level. He might also become more reserved, as the magnitude of the Legendary Pokemon's power and the secrets they hold would make him more cautious. His relationships with his existing Pokemon would also shift. They would look up to him even more, and he would have to learn to manage their newfound respect while still maintaining the bond of friendship.
His view of victory and defeat changes. In the regular series, winning battles is about skill and strategy with his Pokemon. But as a demon - influenced Ash, he might start to see victory in a more cut - throat way, which could lead to him making decisions that he wouldn't have made before. This change in his character development makes the fanfiction story very different from the original Pokemon narrative.
He can become more confident in his abilities. Since Legendary Pokemon are so powerful, if Ash can form a bond with one and work together successfully, it boosts his self - assurance. In these fanfictions, he might start to believe more in his own intuition and skills as a trainer. For instance, if he manages to communicate with and help a Legendary like Celebi, he'll see himself as someone capable of handling extraordinary situations.
When Ash is a trainer, he is constantly on the move from one gym to another. As a researcher, he has to be more stationary at times. He needs to set up research camps and spend long hours observing Pokemon. This makes him more detail - oriented. He can't just rush into things like he does in battles. He has to carefully record every little detail about a Pokemon's habits, diet, and habitat. His relationships with his Pokemon also change. Instead of just training them for combat, he now studies them as unique creatures with their own value beyond just being strong fighters.
The appeal lies in seeing Ash in new and exciting situations. With legendaries involved, his journey becomes more epic. It's like taking the underdog story of Ash in the anime and supercharging it.
In Ash-centered legendary Pokemon fanfiction, often Ash has extraordinary adventures. He might form unique bonds with legendary Pokemon that are not seen in the official storylines. For example, he could befriend a Mewtwo and together they face off against an evil organization trying to clone more powerful Pokemon. These fanfictions allow for a lot of creativity, expanding on Ash's character and his relationships in the Pokemon world.
There are also fanfictions where Ash catches Rayquaza. This could be set during a time when the sky is in chaos due to some dark energy. Rayquaza is drawn to Ash because of his pure heart and determination. Ash, with his usual courage, teams up with his pokemon to assist Rayquaza in restoring balance. As a result, Rayquaza allows Ash to catch it.
Ash develops by learning new strategies. In Pokemon Conquest, battles are different, so he has to adapt, which makes him more versatile. He also develops his relationships with new Pokemon, which broadens his understanding of different Pokemon types.
Ash often becomes more confident in these fanfictions. He learns new ways to communicate with his Pokemon during contests, which makes him a better trainer.
In this fanfiction, Ash's character development might involve him becoming more empathetic. He could meet Pokemon or characters in the Lunar region who are in difficult situations. For example, if there are Pokemon being exploited in the Lunar region, Ash would step in to help. This would make him grow as a person and a trainer. Also, his understanding of different types of Pokemon and their needs could expand, since the Lunar Pokemon might have different requirements compared to the ones he's used to. He might also develop new skills in communication, if the Lunar region has its own way of communicating with Pokemon.
Arceus is quite popular. Given that it's considered the creator of the Pokemon universe in the official lore, it often has a significant role in fanfictions. Mewtwo is also very common. Its powerful psychic abilities and complex backstory make it a favorite for fanfic writers to explore. Another popular one is Lugia. With its majestic appearance and its connection to the sea, it's often a central figure in many stories.