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.
In addition to the ones mentioned, Diantha, the Kalos Champion, is a great character to include. Her elegance and strength in battles can be a focal point. Also, Shauna, Tierno, and Trevor, the friends of Calem or Serena, can bring a lot of fun and friendship dynamics to the story. They can have their own mini - adventures within the larger fanfiction, like exploring a new part of the Kalos region together or trying to catch a rare Pokemon.
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.
Pikachu is definitely a common character. It's Ash's most loyal partner and is always by his side during his adventures. Serena is also often present. She has her own dreams and goals related to Pokemon and often travels with Ash, providing support and sometimes even competing with him.
Give them unique personalities. For example, a trainer who is extremely shy but has a very powerful Pokemon. The contrast between their quiet nature and the strength of their Pokemon can create interesting dynamics. Also, consider their goals. A character could be obsessed with collecting all the Kalosian Pokemon forms.
A plot where Shauna participates in a high - stakes Pokemon tournament. She faces off against tough opponents, and each battle teaches her something new about herself and her Pokemon. The fanfiction could focus on her mental and emotional journey during the tournament, from the nerves before the first battle to the elation of victory or the disappointment of defeat.
It could be about Shauna's journey in the Kalos region. Maybe it focuses on her interactions with the player character, her growth as a trainer, and her experiences with different Pokemon. For example, it might detail how she overcomes challenges in battles and forms deeper bonds with her Pokemon.
One main event could be the battles against Team Flare. Their attempts to carry out their devious plans are a big part of the story. For example, their actions at the Lysandre Labs are crucial. Another event could be the Mega Evolutions. Trainers discovering and using Mega Evolutions in battles against strong opponents. And of course, the gym battles that are part of the journey to become the Pokemon champion in the Kalos region.