Another theme is mutual respect. Despite their differences, they come to respect each other's skills and abilities. In many fanfictions, this respect is shown through their interactions during Pokemon training sessions or competitions.
You can try fanfiction websites like Archive of Our Own (AO3). There are a large number of Pokemon fanfictions there, and you're likely to find some great ones about Raihan and Piers. Just use the search function and type in their names.
Friendship is also a big theme. Despite their rivalry, stories often show how they respect and care for each other. For example, they might help each other in a difficult situation, like when facing a powerful wild Pokemon or dealing with a crisis in the Pokemon league. And sometimes, there are stories that develop their relationship into a romantic one, which is a less common but still interesting theme in this kind of fanfiction.
You can try searching on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms usually have a large collection of Pokemon fanfictions, and you might be able to find some great stories about Leon and Raihan there.
One common theme is self - discovery. Piers often has to figure out his place in the Pokemon world. Another theme is loyalty, especially towards his Pokemon. For example, in many fanfics, his Grimmsnarl is shown as a very loyal partner.
One interesting story could be about Piers' journey to become a better Gym Leader. In this fanfiction, he might face a new and powerful Pokemon trainer who challenges his traditional ways of leading the Gym. Another could be a story where Piers teams up with a young trainer to explore an uncharted region filled with rare Pokemon. And there might be a fanfiction that delves into Piers' past, like his childhood and how he got into Pokemon training in the first place.
One common theme is Piers' relationship with his Pokemon. Fanfictions often explore how he trains them, the bond they share, and how it affects his battles.
You can start by looking on popular fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fanfictions across various fandoms, including Pokemon. Just search for 'Pokemon Piers' and you'll likely find a good number of stories. Another option is FanFiction.net. It's been around for a long time and has a lot of user - generated content related to Pokemon Piers as well.
There is a fanfiction called 'Piers' Redemption'. In this story, Piers has made some mistakes in the past that he's trying to make up for. It shows his growth as a character. Also, 'Piers and the Mysterious Trainer' is good. It involves a mysterious trainer coming to town and Piers having to figure out their intentions, all while dealing with his own Gym responsibilities.
Friendship is a big theme. The deep bond between Chris and Piers is a great foundation for fanfiction. Many stories show how their friendship endures through difficult times. Also, the theme of heroism comes up a lot. They are both heroic characters, and fanfiction often expands on that aspect of their relationship.