In fanfiction, Ash might improve his pokemon's IV through special training regimens. For example, he could focus on specific battle scenarios that target areas related to IV stats like speed or strength. He might also seek out rare items in the fanfiction world that have the power to enhance these inherent values.
One possible consequence could be that his Pokemon become extremely powerful. For example, Pikachu might master new electric - type moves that are far more potent than before. This could lead to Ash winning more battles and championships in the fanfiction world.
Well, without actually reading the specific fanfiction, it's hard to say exactly which six Pokemon Ash trains. It could be a combination of his classic ones like Pikachu, Charizard, Bulbasaur, Squirtle, and then maybe some more unique or rare ones that the author has chosen for a new and interesting story line.
In this 'Ash trains only six pokemon fanfiction', the uniqueness lies in the focus it gives to the six Pokemon. In other fanfictions, there can be a sprawl of different Pokemon characters, which can sometimes make the story feel scattered. Here, with only six, each Pokemon has a more prominent role. The relationships between Ash and these six are likely to be explored in greater depth. Also, the battles and training regimens are likely to be more detailed for these six, as the author has to work within the constraint of this small number, making it different from the more expansive Pokemon fanfictions.
If we consider the common growth pattern in the Pokemon series, Charmander evolving into Charmeleon could be an early evolution in the fanfiction. Since Charmander has a clear evolution line and Ash has a strong bond with it, it would make sense for it to be one of the first to evolve, perhaps due to a tough battle or a special encounter that accelerates its growth.
One idea could be that Ash discovers a Sylveon in a forest. The Sylveon is injured and Ash takes it upon himself to nurse it back to health. This could lead to a strong bond between them, and Sylveon could become a unique addition to his Pokémon team, with new adventures and battles ensuing.
Obviously, Ash is one of the main characters. He's the protagonist who has a passion for pokemon and is always eager to become a pokemon master. And the legendary pokemon he encounters or befriends would also be important characters. For instance, if it's Lugia, Lugia would play a major role in the story as it's a very powerful and mysterious pokemon.
His Pokemon might be a bit confused at first. Pikachu, for example, is used to their adventures on the road. But they'll soon adapt. They could make new Pokemon friends at the school too. And they'll be there to support Ash during his school challenges, like in battles or tests.
I'm not entirely sure as I haven't read that specific fanfiction. But generally, it might be about Ash's adventures with his Pokémon in a rather unique or different way compared to the original Pokémon story. It could involve new challenges, relationships, or character developments for Ash and his Pokémon.