The plot could also revolve around Ash's relationship with Litten in a more emotional way. Litten might be an abandoned Pokémon that Ash finds. Ash has to earn Litten's trust, which is not easy. As they journey together, Litten gradually opens up to Ash, and they form a very strong bond. Along the way, they meet other trainers and Pokémon, and their story becomes an inspiration for others in the Pokémon world.
Perhaps in this fanfiction, Litten has a special power that only Ash can unlock. Ash, being the kind - hearted trainer he is, discovers this power while trying to protect Litten from some villains. This leads to a series of events where they travel across different regions to find more about Litten's origin and the extent of its power.
One possible plot could be that Ash, instead of starting with Pikachu in the Alola region, starts with Litten. Litten could be a difficult Pokémon to train at first, but Ash's determination helps him bond with it. They could go on adventures in Alola, facing Team Skull together and Litten evolving as they overcome various challenges.
You can try fanfiction platforms like Archive of Our Own (AO3). It has a vast collection of Pokémon fanfictions, and chances are you'll find some that involve Ash starting with Litten there. Just use the search function on the site.
Perhaps it's a story where Ash and Froakie form an even deeper bond than in the original series. They might go on a quest to find a rare Pokemon that only Froakie can sense, and along the way, Ash learns more about Froakie's past and its potential. Froakie could also teach Ash some new strategies in battles that help him become a better trainer overall.
The plot might involve Ash starting his journey all over again, but this time with a Charizard as his very first Pokémon. Since Charizard is a powerful and somewhat stubborn Pokémon, Ash would have to learn how to handle it right from the start. He could face challenges like other trainers trying to steal Charizard because of its rarity. Ash would have to prove his worth as a trainer and his connection with Charizard to keep it by his side.
Well, it could be about Ash starting his journey with a Ralts. Maybe Ralts is a special one that has unique powers. Ash and Ralts could go through various gym battles together, with Ralts evolving at crucial moments to help Ash win. They might also face some tough opponents who are after Ralts' power.
The plot might involve Ash's Dratini evolving quickly due to their unique connection. It could also have elements of Ash trying to prove that Dratini can be a very powerful Pokémon from the start. He might enter it into Pokémon contests and battles, showing off its unique moves and abilities.
The fanfiction could revolve around Ash and Riolu's bond. Since Riolu can sense auras, it might be able to sense Ash's strong will and determination. They could go on an adventure to discover more about Riolu's species and its hidden powers. Along the way, they meet other trainers and Pokémon, and Riolu grows stronger with Ash's guidance.
Well, the plot might be that Ash stumbles upon a lost Togepi. Since Ash has a kind heart, he takes it under his wing. They then embark on a journey where Togepi starts to show some extraordinary powers that no one has ever seen before. This attracts the attention of Team Rocket who try to capture it. Ash and his friends have to come up with clever plans to outwit Team Rocket every time they make an attempt.
One possible plot could be that Ash finds Charmander much earlier than in the original series. They could form a really strong bond quickly and start training in a different way. Maybe they focus more on speed and stealth rather than the usual battling approach at first.
Well, it could be a story where Ash meets an Abra that has some special powers. Maybe this Abra can see into the future and helps Ash in his Pokemon journey. For example, it warns Ash about upcoming tough battles or where to find rare Pokemon.
A plot could involve Ash starting his journey with a Deino. Deino being a rather unique and not so common Pokémon. They could face challenges in training it as it's a bit wild at first. Ash might have to find special ways to bond with it, like exploring caves together which is a natural habitat for Deino. And through their adventures, they meet new Pokémon and trainers, with Deino gradually evolving and becoming a stronger part of Ash's team.