One possible plot could be that a young trainer discovers a hidden entrance to the Hall of Origins and encounters Missingno there. The trainer then tries to figure out what Missingno is and how it relates to the other Pokemon in the Hall.
A different plot could be that Missingno is a guardian of the Hall of Origins, but has been corrupted over time. A hero emerges who must enter the Hall, face Missingno, and restore it to its original state. Along the way, the hero would learn about the true nature of the Hall of Origins and the importance of Missingno in its history, despite its current glitchy and potentially dangerous form.
A fanfic centered around the Pokemon Hall of Origins and Missingno could also delve into the impact of Missingno on the Pokemon world. Since it is a glitch, it could have unforeseen consequences on the balance of the Pokemon ecosystem within the Hall of Origins. Maybe in the fanfic, Missingno's presence starts causing strange phenomena in the Hall, such as glitches in the appearance of other Pokemon or disruptions in the energy flow that is crucial for Pokemon creation and evolution. The fanfic could then be about the Pokemon trainers or scientists in the Hall of Origins trying to figure out how to fix these issues caused by Missingno.
The plot could be about Mewtwo trying to control Missingno's glitch powers.
It could be about Silvally's origin story. Maybe it explores how Silvally was created in the Hall of Origins. It might delve into the experiments or the purpose behind its creation.
In the fanfic, trainers might gather in the Pokemon Hall of Origins meeting to show off their rarest Pokemon. It could be a place for trading rare Pokemon or sharing unique training methods.
Well, it could center around trainers who embark on a journey to discover the Pokemon Hall of Origins. The fanfic could describe their adventures, the challenges they face while trying to reach this mysterious place, and the amazing Pokemon they encounter along the way. It may also include their interactions with other trainers who have the same goal.
Well, in a fanfic, the Lake Trio could face a threat within the Hall of Origins. For example, an evil force might try to steal their powers. Uxie's knowledge could be used for wrongdoings if captured. Mesprit's emotions could be manipulated to cause chaos, and Azelf's protection could be weakened. The story could revolve around how the Lake Trio overcomes this threat with the help of a brave trainer or other Pokemon.
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.
The fanfiction could revolve around a group of friends who accidentally stumble upon the entrance to the Pokemon Hall of Origins while exploring an ancient forest. Latios appears and decides to lead them inside. Inside the hall, they find a series of rooms, each representing a different era in Pokemon history. Latios shares stories and knowledge about these eras, and the friends learn about the origin of their favorite Pokemon. As they progress, they also face challenges that test their friendship and their understanding of Pokemon.
A fanfic centered around the Pokemon Lake Trio in the Hall of Origins might involve a young trainer's journey. The trainer, curious about the legends of the Lake Trio, embarks on a quest to find the Hall of Origins. Once there, they discover that Uxie's knowledge is not easily accessible, Mesprit's emotions are overwhelming, and Azelf's protection is hard to bypass. But through determination and respect for the Pokemon, the trainer gradually uncovers the secrets of the Hall and forms a special bond with the Lake Trio.
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.