One idea could be that Ash and May travel back to the time when the first Pokemon were discovered. They could witness the first encounters between humans and Pokemon and learn about the origin of Pokemon battles. Another plot could involve them traveling to a future where Pokemon have evolved in unexpected ways, and they have to adapt to these new forms of Pokemon. Maybe they also meet their future selves and gain insights into their own destinies.
A great plot might be that they travel back in time to a crucial event in Pokemon history that was always a mystery. For example, the disappearance of a certain legendary Pokemon. Ash and May could then try to solve this mystery and in the process, change the course of Pokemon history. This could lead to all sorts of interesting consequences in their own time when they return.
They could time travel to a period when there was a great war between different Pokemon regions. Ash and May would find themselves in the middle of the chaos, having to choose sides or find a way to stop the war. They might discover long - lost Pokemon types that were thought to be extinct. This would not only be an adventure for them but also a way to learn more about the complex relationships between different Pokemon species and regions.
One interesting plot could be Ash traveling back to the time of the first Pokemon ever discovered. He could witness the origin of Pokemon-human relationships and perhaps influence how they evolved over time. Another idea is Ash traveling to a future time where Pokemon have developed new and strange abilities, and he has to adapt quickly to this new environment. Also, he could go back in time to prevent a great Pokemon disaster that was hinted at in the original series.
One idea could be Ash and May getting lost in a mysterious new region together. They have to rely on each other's skills and the Pokemon they have with them to find their way out. Another plot could be that they enter a Pokemon contest and cooking competition combined. May focuses on the contest part while Ash tries his hand at cooking for the Pokemon. A third plot might be that they discover a rare Pokemon that is in danger and they team up to protect it from a group of poachers.
One idea could be that Ash and Serena travel back to the very beginning of Ash's journey. They could use their knowledge of future events to help Ash catch Pokémon more effectively, like getting a Pikachu right away without the initial struggle. Another plot could involve them traveling to a time when a powerful and rare Pokémon was last seen, and they have to work together to find it and protect it from evil organizations.
One plot idea could be that Ash, May and Manaphy embark on a journey to find a rare and powerful Pokemon that is said to be able to control the tides. Along the way, they face various challenges like battling Team Rocket who also wants to capture this Pokemon for their evil plans. Manaphy's unique abilities help them get out of tough situations.
One idea could be that Ash and Serena travel back to the beginning of Ash's Pokémon journey. They could use their knowledge of future events to help Ash catch even more powerful Pokémon right from the start. For example, they might know where to find a rare Pikachu variant and help Ash catch it, changing the whole dynamic of his early battles.
I'm not sure specifically as there could be many different versions of this fanfiction. But generally, it might involve Ash and May going on adventures through time, perhaps encountering different Pokemon species from various eras, facing challenges related to time - like fixing time - rifts or something.
Maybe in the fanfiction, Elesa's Pokemon get lost in an unknown region and Ash offers to help her find them. During their search, they encounter rare and powerful Pokemon, and they also discover a hidden mystery about the region that they are in. This adventure could strengthen their friendship and respect for each other.
A possible plot is that Ash is separated from his friends during a powerful storm. Alone, he stumbles upon an ancient Pokemon ruin. He then has to decipher the secrets within the ruin with the help of his Pokemon, all while trying to reunite with his friends. He might learn some long - forgotten Pokemon training techniques in the process.
One idea could be that Ash mentors a young trainer who is afraid of Pokemon battles. Ash uses his own experiences to show the kid how to overcome fear and build a bond with their Pokemon. For example, he might share how he was once scared of facing strong opponents like Brock in his early days but learned to trust in Pikachu's abilities.
A possible plot for a Pokemon Ash and Arceus fanfiction could be that Ash is summoned by Arceus to a sacred place. There, Arceus reveals that Ash has been chosen to help balance the powers of all the different types of Pokemon in the world. This would involve Ash traveling to different regions and facing challenges related to each type of Pokemon. For example, in a region dominated by fire - type Pokemon, he might have to find a way to cool things down without harming the Pokemon. Another plot could be that Ash accidentally angers Arceus, and as a punishment, he has to go on a journey to prove his worth and respect for all Pokemon. He has to complete tasks like helping a group of endangered Pokemon species thrive again. And, a third plot idea is that Arceus gives Ash the ability to transform into different Pokemon forms for a short time to better understand them, and Ash uses this power to solve various problems in the Pokemon world.