One interesting storyline could be the discovery of a new and extremely powerful Pokemon species that the Ultra Guardians have to figure out how to handle. It could be a Pokemon with unique abilities that pose a threat to the existing ecosystem in the Pokemon world.
The main characters would likely include the Ultra Guardians themselves. They are probably a group of trainers with special skills or abilities. There could be a leader among them, who is very experienced and has a deep knowledge of Pokemon.
One aspect of Pokemon Sun and Moon Ultra Guardians fanfiction could be the character development. The Ultra Guardians in the original game have unique personalities and abilities. In fanfiction, writers might expand on their backstories, like how they came to be part of the Ultra Guardians. For example, they could explore the early training days of a character and how they overcame difficulties to be a competent guardian.
A common theme is the power of unity. The Ultra Guardians often work together in the original concept, and this is emphasized in fanfiction. They rely on each other's skills and Pokemon to overcome challenges. For instance, when facing a powerful Legendary Pokemon, they combine their efforts and strategies.
One interesting storyline could be about a trainer who discovers a rare giant Pokemon in a hidden, ancient forest. The trainer has to learn how to communicate and bond with this massive creature, facing many challenges along the way.
One interesting storyline could be a young Pokemon breeder starting from scratch. They might find a rare and weak Pokemon egg. Through careful nurturing, using the right food, and training methods specific to that Pokemon type, they raise it into a powerful and unique Pokemon. This journey of growth and discovery can be really engaging.
One interesting storyline could be about a new student at Pokemon University who discovers a rare and powerful Pokemon on campus. This Pokemon is different from the ones usually found in the local area, and it leads to an adventure as the student tries to learn more about it while also dealing with schoolwork and making friends.
One interesting storyline could be about a unique Pokemon species found only in America in the fanfic. It might involve a trainer's journey to discover and befriend this rare Pokemon.
One interesting storyline could be about a trainer who discovers a rare and powerful Pokemon in the Unova region that has been lost for centuries. This Pokemon could have unique abilities that change the way battles are fought in the fanfic.
I'm not entirely sure as it's a fanfic, but it might be about Pokémon in the Altomare region being guardians in some way. Maybe they protect the city, its people, or some important artifacts or secrets.
One interesting storyline could be a pro pokemon player who has to overcome a rare and powerful pokemon that has been causing chaos in the pokemon league. This would involve intense battles and strategic planning.