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.
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.
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.
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.
Their relationship could develop further through shared adventures. For example, if they team up to rescue a group of endangered Pokemon, they would have to rely on each other's strengths and trust each other completely. This would deepen their bond.
One possible scenario in fanfiction could be that Bonnie catches a strange illness from a new Pokemon she encounters in the Kalos region. This illness might cause her to lose her energy and enthusiasm, which are her usual traits. Her friends, Clemont and the protagonist, would then search for a cure.
I'm not sure specifically as there could be various interpretations. It might involve some dark or spooky events in the Pokemon X and Y universe, like strange disappearances of Pokemon or creepy encounters in certain areas.
One idea could be a story where Naruto is transported to the Pokemon X and Y world. He could use his ninja skills to catch Pokemon in unique ways. For example, he might use his shadow clone jutsu to surround a wild Pokemon and then throw a Poke Ball with perfect accuracy.
The main differences could lie in the art style and the way certain battles or events are depicted. Sometimes, the comic X might focus more on certain characters or story arcs than Y does.