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.
In this fanfiction, Harry could be brought into the Unspeakables to deal with some ancient and powerful magic that has been awakened. He may start off as an outsider among the Unspeakables, but gradually earn their respect. His adventures within the Department of Mysteries could include uncovering long - lost spells and artifacts. This could also lead to a conflict between his loyalty to his old friends and his new responsibilities within the Unspeakables.
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.
A crossover could be that Naruto and his friends learn to be Pokemon trainers. They might have trouble understanding the concept at first but then quickly adapt. For instance, Sasuke could be drawn to dark - type Pokemon because of his own dark - natured abilities.
One potential antagonist could be an ancient magical entity that has been awakened by the experiments of the Unspeakables. It sees Harry and the Unspeakables as a threat to its existence and tries to destroy them. Additionally, there could be a group of anti - Ministry wizards who believe that the Unspeakables are dabbling in dangerous magic and they target Harry as a symbol of the Unspeakables' activities.
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 interesting story could be about Ash's journey in the Kalos region in a more in - depth way. For example, his encounters with different Pokemon and trainers that weren't fully explored in the anime. Another might focus on his relationship with his Pokemon in a new light, like how he trains them specifically for Kalos - style battles.
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.
Perhaps 'y' is a relative of Harry's that was thought to be dead. This relative could have a unique magical heritage that they pass on to Harry, making him even more powerful. For example, if 'y' was a distant cousin from a line of powerful seers, Harry might develop some precognitive abilities.