Naruto's chakra control could be related to how Ash controls the energy flow in his Pokemon. Maybe he could use his chakra knowledge to enhance his Pokemon's attacks or defenses. Also, his ability to learn jutsus quickly might turn into an ability for Ash to quickly understand and train his Pokemon for new moves.
In this fanfiction concept, Naruto's physical abilities like his strength could make Ash more capable in handling physical tasks in the Pokemon world. His sensory abilities from being a ninja could be transformed into a sort of intuition for Ash when it comes to understanding Pokemon behaviors. Moreover, Naruto's strategic thinking from his ninja battles could be applied to Ash's Pokemon battle strategies, making him a more formidable trainer.
One possible plot could be that Naruto, with his ninja skills and determination, takes on the Pokemon world as Ash. He might use his combat experience to develop unique battle strategies in Pokemon battles. For example, he could incorporate his shadow clone jutsu in some way, like using clones to distract opponents' Pokemon while his own Pokemon attacks from an unexpected angle.
Pikachu would probably be very curious. It might zap the lightsaber a bit to see what would happen, and then be in awe of the bright blade. It could also get a bit protective of Ash when he wields the lightsaber, as if it senses the added danger.
It could be a famous Pokémon trainer. Maybe someone who has traveled to many different regions and has a lot of knowledge about rare Pokémon.
Ash would probably be very curious about the Avengers' powers. He might ask a lot of questions and want to see them in action. In return, he could show them his Pokémon and how they fight.
They could impact it by introducing new training methods. For instance, if the OC had knowledge of modern sports training techniques, they could apply some of those concepts to Pokémon training. This might lead to Pokémon evolving faster or developing new moves. The Pokémon battles in the world would become more exciting and unpredictable as a result.
Maybe a new, mysterious villain who has a grudge against Ash or wants to use his skills for their own evil purposes. This villain might be from a far - off region and has special powers that allow them to hypnotize people. They see Ash as a useful tool to carry out their plans in the Pokémon world.
His rival, Gary, could be a likely candidate. Gary has always been competitive with Ash, and in this fanfiction, his jealousy could reach a boiling point, causing him to betray Ash for his own gain, like trying to steal his Pokémon or get credit for his achievements.
Ash could become more confident and wise as a Dragon Master. His decision - making skills would improve as he deals with powerful and often unpredictable dragon Pokémon.
In some Pokemon fanfictions, there could be creative interpretations where Ash is made out to be Red's father. However, in the official Pokemon canon, there is no such relationship between them.
The ending of Ash Ketchum's story sees him achieving his goals, making lasting friendships, and leaving a legacy in the Pok茅mon universe. It's a satisfying conclusion to his adventures.