One idea could be to create an OC who is a detective from a different region, like Unova. They could have a unique Pokemon partner, like a Zorua that can transform and help with investigations in sneaky ways. Their backstory could involve coming to Ryme City to learn new detective techniques.
The 'pokemon detective pikachu graphic novel' likely follows the adventures of Detective Pikachu as he solves mysteries in the Pokemon world. It might involve Pikachu using his detective skills, interacting with other Pokemon and humans, and uncovering secrets within the Pokemon universe.
A great idea for a Pokemon Detective Pikachu fanfic could be to set it in a different region. For example, a region that is mostly covered in ice. Pikachu and Tim would have to adapt to the new environment and the different types of Pokemon there. They could be investigating a series of disappearances of ice - type Pokemon. Maybe there's a secret underground lair where a powerful but misunderstood Pokemon is hiding and Pikachu has to use his detective skills to uncover the truth and save the day.
Detective Pikachu is surely one of the main characters. There might also be other Pokemon and human characters that play important roles, like Tim Goodman who is often associated with Pikachu in the Detective Pikachu storylines.
It could be a Pokemon itself. Maybe a dark - type Pokemon with a grudge against humans and Pikachu in particular. This Pokemon could be using its powers to cause chaos in the city, and Pikachu has to figure out its motives and stop it before it's too late.
A more complex plot could involve Detective Pikachu trying to figure out a conspiracy among a group of humans who are trying to use Pokemon for illegal and unethical experiments. This would involve Pikachu teaming up with other Pokemon and human allies, like Tim, to expose the bad guys. They would have to face many obstacles and dangerous Pokemon controlled by the villains along the way.
In this fanfiction, Greninja could meet Misty. She's often associated with Pallet Town and she has her own set of water - type Pokemon. Their meeting could be interesting as Greninja is also a water - type Pokemon. They might exchange stories about their battles and experiences with water - type Pokemon.
A simple fanfiction could be that Greninja and Delphox are forced to be allies when their trainers are kidnapped by an evil organization. They have to put aside their differences and work together to rescue their trainers. Greninja uses its agility to scout the enemy base, while Delphox uses its fire attacks to create distractions.
One great idea for a fanfiction could be a story where Greninja and Delphox team up to face a powerful, mysterious new Pokemon that threatens their region. They have to combine their unique skills, Greninja's speed and water - based attacks with Delphox's fire - magic and psychic abilities.
One popular type of Pokemon Ash and Pikachu fanfiction might be adventure - based. For example, Ash and Pikachu could embark on a journey to a new and mysterious region filled with undiscovered Pokemon species. They might face challenges like difficult terrains and powerful, previously - unseen Pokemon. In this fanfiction, Pikachu's electric powers could be enhanced in some unique way, and Ash would have to strategize differently to overcome the obstacles.