Well, you could write a fanfic that focuses on the backstories of the gym leaders in Pokemon Platinum. Maybe one of them has a secret past that ties into an ancient Pokemon legend. You could also do a time - travel fanfic where a trainer from the modern day gets sent back to the time when Sinnoh was being formed and has to find a way back while also dealing with the different types of Pokemon that existed then. And of course, a fanfic about a group of misfit Pokemon that form their own little community away from humans could be really interesting.
One idea could be to explore an alternate storyline where the main character fails to stop Team Galactic's initial plan and has to deal with the consequences. Another could be a fanfic centered around a new Pokemon species discovered only in the Platinum region that has unique abilities. Or perhaps a story about a trainer who has the ability to communicate with Pokemon in a more in - depth way than normal trainers and how that affects their journey in the Pokemon Platinum world.
A great idea for a Pokemon Platinum fanfic would be to tell the story from the perspective of a Pokemon rather than a trainer. For example, a Pikachu that has been separated from its trainer and has to find its way back through the dangerous regions of Sinnoh. You could also create a fanfic where the Pokemon world is in a state of chaos because the balance between different Pokemon types has been disrupted. The main character then has to find a way to restore this balance, traveling across Sinnoh and encountering various challenges along the way. This would allow for a lot of creativity in terms of new Pokemon battles and interactions.
One plot idea could be Darkrai's struggle to fit into the Pokemon world of Pokemon Platinum. Since it's often seen as a menacing and mysterious Pokemon, it could be about it trying to prove that it has good intentions. For example, it might try to protect a small village from other powerful Pokemon threats, all while the villagers are initially afraid of it.
Maybe a fanfic where a trainer's Pokemon gets a strange and unique ability due to an encounter with a mysterious Pokemon in the Platinum and Pearl world. This could lead to all sorts of adventures as they try to understand and control this new power.
One idea could be exploring an alternate universe where the main characters have different Pokemon partners. For example, instead of Dawn having Piplup as her starter, she could start with a Chimchar. Another plot could revolve around a mysterious new Pokemon that only appears in a long - forgotten part of the Sinnoh region. It could be a Pokemon with unique powers that both the good and bad guys are after. Also, a story about a trainer who travels through Sinnoh backwards, starting from the Pokemon League and working their way to the beginning of their journey, facing challenges in reverse order.
A great storyline might involve a group of friends who each have different goals in the Pokemon Diamond and Platinum world. For example, one might be focused on winning all the gym battles, while another is more interested in finding and documenting rare Pokemon species. Their different paths cross and they end up helping each other in unexpected ways.
There are fanfictions that focus on the backstories of the Legendary Pokemon in Pokemon Platinum. These might explore the origin of Dialga and Palkia, their relationship, and how they interact with the world of Sinnoh. It could include things like their role in the creation of time and space and how trainers might encounter them in different, more in - depth ways.
Another interesting concept is to write a fanfic about a group of Pokemon that form a secret society. They have their own rules and goals, and the story could follow a human or a Pokemon who stumbles upon this society and gets involved in their affairs.
One idea could be a fanfic where a trainer discovers a new and rare Pokemon species in an uncharted region. Another could be a story about a Pokemon that has unique abilities and how it changes the Pokemon battles in a particular area. Maybe a fanfic that focuses on the friendship between a trainer and a Pokemon that is usually considered difficult to train.
One idea could be a story about a trainer who discovers a rare lemon - colored Pokémon in a hidden grove. The Pokémon has unique abilities related to nature, like making lemon - scented plants grow rapidly. This could lead to an adventure where the trainer has to protect the Pokémon from poachers who want to sell it on the black market.
One interesting idea could be exploring the more scientific aspects of Pokémon. For example, how their powers might be related to real - world physics or biology. Another idea could be a more in - depth look at the Pokémon society, like their culture and economy. And also, perhaps a different take on the relationship between trainers and Pokémon, such as more equal partnerships rather than just the trainer being in control.
A 'pokemon pov fanfic' could be about a Charizard that was abandoned by its trainer. The Charizard's POV could show its feelings of betrayal, how it struggles to survive on its own in the wild, and its journey to find a new purpose or a new group of Pokémon to belong to.