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.
Well, in a fanfic about the Pokemon Hall of Origin and Ultra Beasts, you can expect a wild adventure. The Hall of Origin is a very mysterious place in the Pokemon world. Ultra Beasts are strange and powerful creatures from another dimension. A fanfic might explore how a trainer gets involved with the Ultra Beasts near the Hall of Origin. Maybe they accidentally open a portal to the Ultra Beast's world while exploring the Hall. It could also show battles between the trainer's Pokemon and the Ultra Beasts, with unique strategies based on the Ultra Beasts' strange abilities.
One idea could be a story where a trainer accidentally bonds with an Ultra Beast during an Ultra Wormhole event. The trainer has to learn to communicate with it and protect it from those who want to use it for evil purposes.
Ultra Beasts can fit into the Pokemon Hall of Origin story in a fanfic by being the guardians of the Hall. Maybe they were placed there by some ancient power to protect the secrets within. So when the protagonist tries to enter the Hall of Origin, they have to face these Ultra Beasts.
Well, in some ways it is. For example, these knock off elements can create unexpected challenges for the trainers in the story. It could be a new type of Pokemon with different abilities that the main character has to figure out how to deal with, adding depth to the narrative. Also, it might change the power dynamics between different regions or groups in the Pokemon world, which is really exciting for the story development.
The new story in Pokemon Ultra Sun can bring a fresh perspective to the Pokemon world. It might introduce new friendships between characters. There could be a new tournament or competition added to the plot. Also, the story may have elements that connect the Alola region more closely to other Pokemon regions, like through some ancient artifacts or a traveling trainer from another place who brings new challenges and knowledge to the Alola region.
You can't go wrong with a team of Pikachu, Eevee, Charmander, Squirtle, Bulbasaur, and Pidgey. Pikachu is iconic and has electric - type moves. Eevee can evolve into different useful forms. Charmander is a classic fire - type starter. Squirtle for water - type attacks. Bulbasaur for grass - type moves and Pidgey for early - game flying support.
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.