One idea could be Calem's journey after becoming the champion. Maybe he travels to other regions to learn new battle strategies and meet different Pokemon. Another could be a story where Calem has to team up with his old rivals to face a new, powerful threat to the Kalos region.
One great fanfiction is 'A Journey with Serena and Calem'. It focuses on their adventures in the Kalos region, exploring how their relationship develops during battles and while facing various challenges. The author does a wonderful job of capturing their personalities as seen in the game.
The plot also matters a great deal. It could be something related to their Pokemon journey, like exploring new areas in Kalos that weren't fully covered in the game. Or it could be a more personal story, like Serena dealing with homesickness and Calem helping her through it. A good balance between action - packed Pokemon battles and emotional character moments is key. In a story I read, they were on a quest to find a legendary Pokemon, and along the way, they had heart - to - heart conversations that deepened their relationship.
One possibility could be that Calem's immortality is a result of some ancient Pokemon power. Maybe he stumbles upon a hidden temple in the Kalos region where a powerful Pokemon bestows this gift upon him. This would lead to him having to deal with the loneliness that comes with immortality as he watches his friends and family age and pass away.
I think Professor Sycamore would be an interesting character to pair with Calem in fanfiction. Calem could be his assistant for a special research project on Mega Evolution. This would give Calem a chance to learn more about the secrets of Pokemon from the professor. Also, Tierno could be paired with Calem. They could have a dance - off with their Pokemon, which would be a really fun and unique scenario in the fanfiction.
The characters Calem and Serena themselves are very interesting. Their relationship in the game can be explored further in fanfiction, like their adventures together that might not be fully shown in the game. It gives fans a chance to see more of their dynamic.
One interesting plot idea could be Serena and Calem getting lost in an uncharted region of the Pokemon world while on a research expedition. They have to rely on their Pokemon and each other to survive and find their way back. Another could be a story where they compete in a special, high - stakes Pokemon tournament that tests not only their battling skills but also their friendship. And perhaps a plot where they discover a new type of Pokemon together and have to protect it from an evil organization that wants to use it for its own gain.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. They have a large collection of Pokemon X and Y fanfictions featuring Calem and Serena. Just use the search function and type in the relevant keywords.
Well, you could write a fanfiction where the evil team in the X and Y games has a different, more complex motive. Instead of just wanting power or to disrupt things, they believe they are saving the Pokemon world from a future threat that only they know about. And the main character has to decide whether to believe them or stop them, all while exploring the beautiful Kalos region and its unique Pokemon.
His relationships with his friends would likely become strained. They would age while he stays the same. For example, his best friend might start to feel a sense of envy or resentment as Calem doesn't have to face the normal passage of time. His family might be confused and worried about his immortality at first.
One idea could be Serena and Ash getting lost in a mysterious forest in the Kalos region. They have to rely on each other's skills and the Pokemon they have with them to find their way out. Along the way, they might discover a new and rare Pokemon species.