Well, one possible plot could be that Ash, while on his Pokémon journey, somehow stumbles into the wizarding world. Harry Potter then takes Ash under his wing and shows him around Hogwarts. Ash could introduce his Pokémon to the students at Hogwarts, and they could all work together to solve a mystery that involves both magic and Pokémon powers. Maybe there's a dark wizard who wants to use Pokémon for evil purposes, and Harry and Ash have to stop him.
One possible plot could be that Fem Harry, being a big fan of Ash Ketchum, decides to embark on her own Pokémon - like adventure in the wizarding world. She might try to catch magical creatures in a way inspired by Ash's Pokémon-catching methods. For example, instead of using Poké Balls, she could use magic spells or enchanted objects to capture and befriend magical creatures like Kneazles or Nifflers.
A possible plot could be Ash visiting an old, abandoned Pokémon sanctuary. He explores the place quietly, feeling a sense of melancholy. As he walks through the overgrown paths, he discovers an injured and rare Pokémon. He then uses his knowledge and skills in a very calm and methodical way to nurse it back to health. This shows a different side of Ash, one that is more patient and less about the big battles.
One possible plot could be that a villain uses hypnosis on Ash Ketchum to make him do their bidding in Pokémon battles. So instead of using his own strategies, he's forced to follow the commands of the hypnotist. This would create a lot of chaos and challenges for his friends as they try to figure out what's wrong with Ash and how to break the hypnosis.
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.
One possible plot could be that the OC, now as Ash, has all the knowledge from their previous life. They might use this to train their Pokémon more effectively. For example, they could quickly figure out the best training regime for Pikachu, making it even stronger than in the original series. They could also have different strategies in Pokémon battles, using their prior knowledge of different Pokémon types and moves to their advantage.
Well, perhaps May decides to pursue her own Pokémon journey alone, leaving Ash behind. This could break Ash's heart as he might have developed deep feelings for her during their adventures together. Maybe she meets a new trainer who she seems more interested in, and Ash feels replaced.
It's a fictional concept. Harry Potter and Ash Ketchum are from two completely different fictional universes. Harry Potter is about a wizarding world with magic, spells, and a battle against the dark forces. While Ash Ketchum is in the world of Pokémon, focusing on catching and training Pokémon. Combining them in a 'fanfiction' way is just a creative and often humorous idea made up by fans, not an official or real concept in either of the original franchises.
One idea could be that Ash gets lost and somehow ends up in the wizarding world. He could use his Pokémon skills and knowledge to adapt and help the Hogwarts students in their magical studies. For instance, his ability to communicate with Pokémon might be similar to how wizards communicate with magical creatures in Harry Potter.
One common theme could be adventure. Since both Harry Potter and Ash Ketchum are known for their adventures in their respective universes, combining them in fanfiction often leads to exciting new adventures. Maybe they team up to fight a new, powerful villain that threatens both the wizarding world and the Pokémon world.
The plot could involve Ash making new friends in the High School DxD setting. He might befriend some of the devils like Rias Gremory. His kind-hearted nature from the Pokémon world could be a contrast to the more complex and often self - interested characters in High School DxD. He could introduce them to Pokémon and they could in turn teach him about their magic and powers.