The Ultra Beast could completely change the direction of Ash's journey. It might introduce him to new regions or dimensions he has never explored before. For example, if the Ultra Beast has the ability to open portals, Ash could end up in places with new Pokémon species to discover and new challenges to overcome.
The Ultra Beast could act as a catalyst for Ash's personal growth. It could expose him to a level of danger and mystery that he has not faced before. This could force him to re - evaluate his relationships with his Pokémon and his goals. Maybe he realizes that there are bigger things at stake in the Pokémon world than just winning battles and collecting badges, and he becomes more involved in the greater good of protecting all Pokémon, including Ultra Beasts.
Well, it might center around Ash getting transported to the world of Ultra Beasts. There, he has to find his way back home. Along the way, he befriends an Ultra Beast that helps him survive in this strange new world. He also has to deal with the different rules and powers that exist in the Ultra Beast realm.
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.
Create unique physical traits. Maybe an Ultra Beast has a hidden ability that is only visible when it's in a certain mood, like glowing patterns on its body. Also, you could give it a special way of moving, like floating in a spiral pattern instead of walking.
It would change his journey a great deal. Firstly, having a shiny Charmander would make him stand out more. Other trainers would be more likely to challenge him, either to prove themselves against someone with a rare Pokémon or to try and get his Charmander. Also, trainers with more experience might offer to help Ash train his shiny Charmander, which could lead to new training techniques. In Pokémon contests, his shiny Charmander would be a show - stopper, giving him an edge in those aspects of his journey as well.
Ralts could make Ash more empathetic. Since Ralts is a very sensitive Pokémon, Ash would need to be more in tune with its feelings. This would cause him to be more understanding of all Pokémon in general.
Growlithe could be a very loyal addition to Ash's team. It might have a more protective nature compared to some of Ash's other Pokemon. This could change the way Ash approaches battles. Instead of always going on the offensive, he might rely on Growlithe to defend the team first. Also, the other Pokemon on the team might look up to Growlithe's courage, which could inspire them to be braver in battles.
The meeting would likely give Ash a new sense of purpose. He might shift his focus from just winning battles and championships to something more grand, like protecting the entire Pokemon universe. He could also meet new and rare Pokemon through his connection with Arceus.
Ash's character would likely become more confident. Starting with a Charizard, which is a very powerful Pokémon, would give him an edge in battles. He would also become more patient as Charizard can be difficult to train at times. For example, when Charizard refuses to listen, Ash would have to find new ways to communicate and gain its respect.
Ash would likely become more responsible. Since Dratini is a relatively rare and potentially powerful Pokémon, he'd have to take extra care. This could make him think more before acting in battles and other situations.
In this fanfiction, Ash could develop better strategic thinking. Froakie's abilities would force Ash to come up with new battle plans. He'd study Froakie's moves and how they can be combined in different ways, thus enhancing his strategic skills. He may also become more empathetic towards Froakie as he discovers more about its nature and feelings, leading to a more well - rounded character.