One idea could be a pokemon shapeshifter that is trying to hide its true form in a human - dominated city. It has to constantly adapt and learn human behaviors to avoid detection.
A plot could involve a group of pokemon shapeshifters who are on a quest to find a magical item that can restore their lost homeland. Along the way, they face various challenges and make new friends and enemies. They use their shapeshifting abilities both for disguise and for combat in different situations.
Perhaps a pokemon shapeshifter discovers it has the power to not only change its physical form but also influence the minds of other pokemon. This newfound power makes it a target for both good and evil forces. It has to decide whether to use this power for the greater good or for its own self - interest, all while trying to keep its identity a secret from most of the pokemon world.
One plot idea could be Ash getting the ability to shapeshift accidentally. For example, he touches a strange Pokemon or an ancient artifact. Then he has to figure out how to control this new power while on his journey to become a Pokemon master. Another idea is that an evil organization wants to use Ash's shapeshifting ability for their own nefarious purposes, so he has to avoid them and protect his friends.
One idea could be a Pokemon that can shapeshift into different legendary Pokemon to gain their powers. For example, it could shift into Mew to use its psychic abilities in unique ways. Another idea is a shapeshifting Pokemon that disguises itself as other common Pokemon to play pranks on trainers. It could be really fun to write about the chaos it causes.
One idea could be that Harry uses his shapeshifting ability to spy on the Death Eaters unnoticed. He could transform into a small creature like a mouse and infiltrate their meetings.
One idea could be a dragon shapeshifter who is forced to hide in human form in a modern city. They have to constantly struggle to keep their true identity a secret while also being drawn to other magical beings in the city. Another plot could involve a dragon shapeshifter falling in love with a human, and having to decide whether to reveal their true form or not. Or perhaps a story where a dragon shapeshifter is on a quest to find a lost magical artifact that is crucial for the survival of their dragon clan.
One idea could be Harry discovers he has the ability to shift into a powerful magical animal like a phoenix. He could use this form to secretly protect Hogwarts from dark forces at night. Another plot could involve Harry being cursed to randomly shift into different animals until he finds a way to break the curse, leading to some comical and dangerous situations as he tries to adapt to each new form.
One plot idea could be Percy using his shapeshifting ability to infiltrate the lair of a powerful enemy. He could transform into a small animal like a mouse to get past defenses and then change into a more formidable form to fight. Another could be Percy struggling to control his shapeshifting, accidentally changing forms at inconvenient times, like during a school exam or a tense conversation with his friends.
One idea could be the main character being reborn as a Pikachu and having to navigate the world with its electric powers while making friends with other pokemon. Another could be being reborn as a Eevee and having the unique ability to evolve into any form at will, which causes both envy and admiration among other pokemon. Maybe the reborn pokemon has memories of being a human and uses that knowledge to outwit trainers and other threats.
An interesting plot for a Pokemon Conquest fanfiction could be a tale of a trainer who loses their memory but still has an innate connection with their Pokemon. As they journey through the kingdoms, they slowly start to regain their memories through their Pokemon battles and interactions. Another plot could involve a forbidden love between trainers from rival kingdoms, and how they try to keep their relationship a secret while also dealing with the pressures of their kingdoms' expectations. You could also create a fanfiction where a new type of Pokemon emerges, and all the kingdoms are vying to be the first to tame and control it, leading to a series of intense battles and political intrigue.
One idea could be exploring an alternate universe where the protagonist starts with a rare and unique Pokémon that's not available as a starter in the original game. Another could be a story about a Pokémon trainer who has the ability to communicate with Pokémon in a more in - depth way than normal, and how that changes their journey in the Unova region. Maybe a fanfiction about a group of Pokémon trainers coming together to solve a mystery that threatens the balance of the Unova region.
A plot could revolve around a Pokemon RPG fanfiction where the main character is a Pokemon breeder who accidentally creates a new form of an existing Pokemon through a special breeding technique. This new form causes a stir in the Pokemon community, and the breeder has to deal with the consequences, like people trying to steal the Pokemon or Pokemon professors wanting to study it.