One possible plot could be that in a strange crossover world, Naruto sees Pokemon as a threat to his village's way of life. So, he decides to banish them. Maybe the Pokemon's powers are causing chaos in the ninja world, like Pikachu's electricity short - circuiting ninja tools. Naruto, being the hero, takes it upon himself to send the Pokemon back to their own dimension.
One possible plot could be that the singer has some sort of dark secret or power that endangers the village in the Naruto world. Naruto, as the protector, has no choice but to banish the singer to keep everyone safe. For example, the singer might be unknowingly controlled by an enemy and is spreading harmful chakra through their music.
Well, one possibility could be that Naruto is somehow transported to the Rosario Vampire world. He might see the vampires as a threat to the innocent humans there and decide to banish them. Maybe he uses his shadow clone jutsu to create a diversion while he sets up a powerful sealing jutsu to send the vampires to another dimension.
One possible plotline could be that Naruto discovers some sort of corruption within the ANBU. Maybe they are being used for evil purposes by a hidden group. So, in his quest for justice, he decides to banish them to protect the village. Another could be that the ANBU has become too extreme in their methods, and Naruto, as Hokage, believes in a more peaceful and inclusive approach, thus banishing them.
One possible plot could be that Naruto, for some reason misinterprets the actions of the Hanyou and the female Kyuubi. Maybe there's a power struggle in the Hidden Leaf Village and he believes they are a threat to the village's stability. So, he banishes them. As they are banished, they could form an alliance to prove their innocence and fight against whatever force is really behind the problems in the village.
One possible plotline could be that Naruto discovers a group of S - rank ninjas who are secretly plotting against the Hidden Leaf Village. He decides to banish them to protect the village. Another plotline might involve Naruto being forced to banish an S - rank ninja who has committed a heinous crime but has some sort of connection to him. Maybe it's an old friend turned bad. And a third plotline could be that Naruto banishes S - rank ninjas from other villages who have invaded the Hidden Leaf and are too powerful to be kept as prisoners.
Well, it could be about Naruto somehow getting transported to the Pokemon world. Maybe he teams up with Ash and they go on a journey to stop some evil organization that is threatening both the ninja and Pokemon worlds. They could use Naruto's ninja skills and the Pokemon's powers to battle the bad guys.
Well, it could be about Naruto finding himself in the Pokemon world. And various female Pokemon trainers or even some Pokemon themselves (in a more human - like form perhaps in the fanfic's concept) form a harem around him. They might be attracted to his ninja skills, his determination, and his kind heart.
One possible reason could be that Hiashi might see Naruto as a threat to the Hyuga clan's secrets or traditions. Naruto is often associated with unpredictable and powerful abilities, and Hiashi, being protective of his clan, may want to keep him at a distance to safeguard the clan's interests.
A common plotline could be Naruto returning to Konoha as a powerful and changed individual. He might be hesitant to help the village at first due to his banishment, but eventually, his kind heart prevails. Konoha, in turn, has to grovel and make amends for their past mistake.
One idea could be that the Pokemon are brought into the Naruto world and are seen as strange chakra - infused creatures. Naruto himself could befriend a Pikachu - like Pokemon that has a special jutsu - like ability. For example, it could use electric attacks in a way similar to how Naruto uses his Rasengan. The Pokemon trainers could be seen as a new type of ninja, with their Pokemon being their summons.