His long - time friends like Brock and Misty would have mixed feelings. On one hand, they would be excited for Ash because having a legendary pokemon is a big deal. But on the other hand, they might worry that Ash would change or that the legendary pokemon could bring danger. For new trainers he meets, they would likely look up to him immediately, but also feel a bit intimidated.
Well, other trainers would probably be both jealous and in awe. Some might try to befriend Ash just to get closer to the legendary pokemon. Others, especially those with a competitive streak, would see Ash as a huge threat and might be less friendly towards him.
The shiny Pokemon could make Ash a target for some evil organizations. His friends would then have to be more protective of him. For example, Team Rocket might be more desperate to steal the shiny Pokemon. This would strengthen Ash's bond with his friends as they all work together to protect the shiny Pokemon and each other from the threats, and it could also lead to some heroic moments where they prove their loyalty to one another.
It makes his relationship with other trainers rather unique. Other trainers might view Ash with a mix of awe and envy. Since he was raised by Legendary Pokemon, they may assume he has some special training methods or insights. Some trainers might be eager to learn from him, while others could be intimidated and see him as a rival to be defeated at all costs.
Ralts could make Ash more empathetic. Since Ralts is a psychic - type Pokémon that can sense emotions, Ash might become better at understanding the feelings of other Pokémon and people. This could help him in his journey to be a better Pokémon trainer.
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.
If Ash starts with a legendary pokemon such as Rayquaza, it could be that there are abnormal weather patterns in the Pokemon world. Rayquaza has the ability to control the weather. Ash and Rayquaza team up to figure out what is causing these extreme weather changes. Along the way, they meet other trainers who are also affected by the weather problems. Ash has to prove that he is worthy of having a legendary pokemon by using Rayquaza to restore balance to the weather.
Well, consider Ash starting in the Hoenn region in a fanfiction. The Pokémon in Hoenn are known for their diverse abilities and forms. His Pokémon from other regions might feel a bit out of place at first. But as they explore Hoenn together, they would learn to adapt. His relationship with his Pokémon could become more collaborative as they all face new challenges. For instance, his Pikachu might have to deal with stronger Electric - type Pokémon in Hoenn, which would make it rely more on Ash for training and support. His other Pokémon would also have to learn new techniques to compete, and this shared struggle would deepen their bond with Ash.
Ash's transformation into a Gardevoir would have a complex impact on his relationships. Some Pokemon that were once his rivals might see him in a new light and either be more respectful or more envious. His bond with his own Pokemon team would change too. They would have to adapt to his new abilities and appearance. And he would form new relationships with Pokemon that are more associated with Gardevoir's kind, like other Psychic or Fairy - type Pokemon.
His relationship with Sasuke would be greatly affected. Sasuke might initially be confused or even a bit jealous of Naruto's new form and powers. But as they face challenges together, they would learn to work with Naruto's Pokemon - like abilities. For example, if Naruto could fly as a certain Pokemon, he could help Sasuke in battles in new ways.
If Ash becomes a female in the fanfic, his relationships with his Pokemon friends would also be different. His Pokemon might sense the change and some could be more affectionate, while others might be a bit confused at first. Regarding his human friends, his relationship with Gary would take an interesting turn. Gary might be more intrigued by this new Ash and could either be more competitive or try to help her adjust. And when it comes to Professor Oak, he might be more fatherly or have different expectations of Ash now that she is female, perhaps expecting her to focus on different aspects of Pokemon research or training.
Obviously, Ash is one of the main characters. He's the protagonist who has a passion for pokemon and is always eager to become a pokemon master. And the legendary pokemon he encounters or befriends would also be important characters. For instance, if it's Lugia, Lugia would play a major role in the story as it's a very powerful and mysterious pokemon.