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.
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.
Another theme is the power of friendship. Ash's relationship with his Pokemon is central. When he meets Arceus, his Pokemon friends might play a crucial role in the encounter. For example, Pikachu could use its electric attacks to protect Ash if there's any danger during the meeting.
Well, the plot could involve Ash getting transported to a special realm where Arceus resides. Maybe Arceus sees something special in Ash and decides to test him. Ash could be given tasks that are related to saving the Pokemon world from a great danger that only he, with the help of Arceus, can prevent.
In such a fanfiction, Ash might gain some extraordinary powers. Since Arceus is a very powerful Pokemon, it could bestow upon Ash the ability to understand all Pokemon languages instantly. This would give him an edge in his Pokemon journey, allowing for deeper connections with his Pokemon and better strategies in battles.
In this fanfiction, Ash's character development could be significant. Since Arceus is such a powerful and wise entity, Ash may start to think more strategically in battles. He might also become more empathetic towards Pokémon, as Arceus would likely instill in him a greater respect for all Pokémon. This could lead to him making different choices when it comes to capturing and training Pokémon, focusing more on their well - being and less on just winning battles.
It would likely bring a new level of harmony (literally) to Ash's team. Since Meloetta has musical powers, it could use its melodies to boost the morale of the other Pokémon on the team. For example, before a big battle, Meloetta could sing a song that makes Pikachu feel more energetic and ready to fight.
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.
Their meeting could be quite formal at first. Ash, being a respectful trainer, would bow or show some form of respect. Queen Ilene, seeing Ash's Pokemon by his side, would be intrigued. She might ask Ash about his travels and his Pokemon. Ash would be in awe of the grandeur of Queen Ilene's court and the different types of Pokemon he sees there.
Ash could face some tough challenges in this fanfiction. He might have to train in harsh conditions to become a champion. For instance, training on a snowy mountain where Pokemon are stronger due to the environment. His team would need to adapt and grow. Maybe he gets a new Pokemon that is a bit of a troublemaker at first but later becomes a key player in his battles.
Team Rocket might be main characters as well. They could be constantly trying to capture Ash or his Pokemon because of his special status. Their bumbling attempts to take advantage of Ash's link to Arceus could add a lot of comical and action - filled moments to the fanfiction. And of course, Arceus itself could be a major character, guiding Ash in some way or interacting with him directly.