It could be about various things. Maybe it focuses on the origin of Pokémon in a fictional and creative way, exploring the backstories of different Pokémon species, their creation, or the place where they first came into existence in the fan - made story.
One possible aspect of a Pokemon Hall of Origin Diancie fanfiction could be the exploration of Diancie's origin story within the Hall of Origin. Maybe it delves into how Diancie came to be associated with such a sacred and mysterious place. Writers might describe the unique powers Diancie possesses in this context, like its ability to create diamonds, and how these powers are connected to the Hall of Origin's energy. Another angle could be the relationships Diancie forms with other Pokemon in this fan - made world. For example, it could encounter legendary Pokemon that also have ties to the Hall of Origin, leading to exciting adventures and battles.
Diancie might meet other Pokemon in the Hall of Origin that have long - lost connections to it. For example, there could be an old Pokemon that was once a guardian of the Hall and now Diancie has to learn from it. This would create a great story of mentorship and discovery.
There could be a fanfiction where a group of Pokémon researchers accidentally stumble upon the entrance to the hall of origin while studying an ancient ruin. As they explore it, they discover secrets about Pokémon evolution that were previously unknown.
Well, it could be about a trainer who discovers a hidden entrance to the Hall of Origin. There, they meet legendary Pokemon and learn ancient secrets of Pokemon creation.
It could be about a human who discovers a hidden entrance to the Pokemon Hall of Origin. This human might have a special bond with a particular Pokemon that leads them there. Maybe they are on a quest to learn the secrets of Pokemon creation or to find a way to stop an evil force that threatens the balance in the Pokemon world.
It might be that the fanfic focuses on a trainer who discovers Necrozma's link to the Hall of Origin. This trainer could be trying to stop Necrozma if it's causing chaos, or perhaps they're trying to help it. They would have to navigate the mysteries of the Hall of Origin, which could be filled with ancient Pokemon knowledge and power sources. There could be other Pokemon guardians in the Hall of Origin that the trainer has to face or befriend while dealing with Necrozma.
There might be some legendary Pokemon that are guardians of the Hall of Origin. For instance, Arceus could be a key character, as it has a strong connection to the Hall of Origin. And then there could be other trainers who are either rivals or allies of the main trainer in the story. They could all have different motives regarding Necrozma and the Hall of Origin. Some might want to capture Necrozma for its power, while others want to protect it or the Hall of Origin from harm.