Maybe Ash's kids could have unique Pokémon partners that are hybrids or have special abilities. For example, a Pikachu that can fly or a Charmander with ice - type moves. This would make their journey really exciting as they explore the potential of these special Pokémon. And they could also meet some of Ash's old friends and rivals along the way, who could offer advice or challenges.
You can start by giving them distinct personalities. For example, one of Ash's kids could be really shy but extremely brave when it comes to protecting Pokémon. Then, you can show their growth through the challenges they face. If they have a fear of a certain Pokémon type at first, but later overcome it, that's a great way of development.
In a fanfic, Ash could be turned into a vampire by an ancient, powerful Pokemon with vampiric abilities. This would completely change his relationship with his other Pokemon. Some might be scared of him, while others would stay by his side. He would then have to learn to control his vampire powers and instincts in order to continue his journey. For example, he'd need to figure out how to be in the sunlight without getting burned as he travels from place to place.
One idea could be that Ash sacrifices himself to save his Pokémon during a really intense battle against an extremely powerful and evil Pokémon. Another might be related to a disease spreading in the Pokémon world that Ash contracts and unfortunately doesn't survive. Maybe in a fanfic, he gets caught in a natural disaster in a far - off region while on a journey and perishes.
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.
Another interesting concept is that Ash is actually a long - lost Jedi in a past life. His connection to Pokémon in his current life is a manifestation of his latent Force abilities. He discovers an ancient lightsaber and starts to remember his Jedi training. His Pokémon friends then become his companions on his journey to restore balance to the Force in both the Star Wars and Pokémon universes.
Another interesting plot could be a time - travel story where Ash and Cynthia are sent back in time to the early days of the Pokémon world. They have to adapt to the different rules and ways of training Pokémon back then while also trying to find a way back to their own time.
One plot idea could be that Ash is captured by a new and powerful villain who wants to use his Pokémon knowledge for evil. Another could be that he's captured by a group who mistake him for someone else and he has to prove his identity while trying to escape. Maybe he's captured by an ancient Pokémon that has some sort of grudge against trainers and he has to convince it that not all trainers are bad.
Well, one possible plot could be Ash having to rely on his other senses more. For example, he might develop an even keener sense of hearing to detect the movements of Pokémon. Maybe he forms a special bond with a Pokémon that helps him navigate the world, like a psychic type that can communicate with him directly in his mind.
One good fanfic could be 'Ash's Homecoming'. It focuses on Ash returning home to Pallet Town and his heartwarming interactions with Delia. It shows their strong bond through simple daily activities like having dinner together and sharing stories of his adventures.
Another plot could involve a Pokémon contest where May is a contestant and Ash is there to support her. But something goes wrong with the contest rules due to a villain's interference. Ash and May then team up to expose the villain and make sure the contest is fair for all the contestants. It could also be a chance for their relationship to grow deeper as they face challenges together.