Well, another option could be to check out Pokémon - centered forums. Some fans might share their own written fanfictions in those places, or at least be able to point you in the right direction for finding ones where Ash has Torchic from the start. These forums are often a great community for Pokémon enthusiasts to exchange ideas and works.
One possible plot could be that Torchic is a special, rare variant that has unique powers. Ash, with his determination, helps Torchic unlock these powers while they face off against powerful new villains in the Pokémon world. They could go on a journey to find a way to fully control these powers and in the process, make new friends and discover new Pokémon species.
One great 'Ash starts with Eevee' fanfiction is 'Eevee's Adventure with Ash'. It shows Eevee evolving in unique ways under Ash's guidance. Another one could be 'Ash and Eevee: A New Bond' which focuses on their initial meeting and how they form a strong connection that helps them in battles.
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.
Social media groups dedicated to Pokémon fanfiction can also be a great place to look. For example, on Facebook or Reddit, there are groups where fans post their works or recommend good fanfictions. So, search for relevant groups and look for the 'Ash starts with Greninja' fanfictions there.
In this fanfiction, Ash could develop better strategic thinking. Froakie's abilities would force Ash to come up with new battle plans. He'd study Froakie's moves and how they can be combined in different ways, thus enhancing his strategic skills. He may also become more empathetic towards Froakie as he discovers more about its nature and feelings, leading to a more well - rounded character.
Ash could become more patient. Since Togepi is a relatively weak and cute Pokémon at first, Ash has to be patient in training it. This would be a change from his sometimes impulsive nature in battles.
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.