A Pokemon professor could also be the main character. They might be researching the Hall of Origin and decide to enter it themselves to gather first - hand data. Inside, they have to use their knowledge of Pokemon and their wits to survive and make important discoveries.
It could be an experienced Pokemon trainer who has already conquered many gyms and is now seeking a greater challenge in the Hall of Origin.
A young and curious trainer who has always been interested in the legends of Pokemon could be the main character. They might have heard rumors about the Hall of Origin and set out to find it.
Obviously, Melmetal could be one of the main characters. Another could be a trainer with a special connection to Melmetal.
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.
It could be about Melmetal's origin story within the Hall of Origin. Maybe it discovers a hidden power there or meets other rare Pokemon.
It could be a young and ambitious trainer. This trainer might have a special bond with a particular Pokemon that gives them an edge in their quest to reach the Hall of Origins.
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.
It could be a professional Pokemon groomer. They are known all over the region for their amazing skills in giving Pokemon haircuts. They have a special bond with each Pokemon they groom, and they often get requests from famous trainers.
The main character could be a young and ambitious Pokemon scientist named Professor Willow. He has just graduated from the Pokemon Research Academy and is eager to make a name for himself in the scientific community. He specializes in studying the behavior of electric - type Pokemon.