Well, the Eevee could have an interesting backstory. Maybe it was once part of a scientific experiment in the Pokemon world that went wrong. Ash would then have to deal with the consequences of that, such as other parties trying to recapture the Eevee. Meanwhile, the Eevee would grow stronger under Ash's care and protection.
Ash's Eevee could learn some unique moves that are not common for Eevee. For example, it might learn a psychic - type move on its own, which could be a sign of its special potential. This could help Ash in battles against tough opponents like Team Rocket's more powerful Pokemon.
In the fanfic, Ash's Eevee might befriend other Pokemon in a very special way. It could act as a sort of mediator between different species of Pokemon. This would not only make Ash's journey more interesting but also help him in situations where he needs to gain the trust of wild Pokemon. For instance, when they enter a new area full of rare and potentially dangerous Pokemon, Eevee's ability to make friends could be crucial for their survival and exploration.
Ash could be in a battle when a stray fire attack from an opponent's Pokemon hits his butt. His Pokemon would immediately go into protective mode. Bulbasaur could use Vine Whip to try and slap the fire out. Ash would be embarrassed but also focused on getting the fire off as soon as possible.
Well, it could be that Ash is in a battle with a trainer who has an Eevee. Maybe the trainer has a special training method for Eevee that makes it a tough opponent for Ash's usual Pokémon. Ash might have to come up with a new strategy to counter Eevee's various moves and abilities.
One possible fanfic could be where Ash discovers an abandoned Eevee. He decides to take it with him on his journey. Eevee quickly becomes a valuable member of his team, evolving into a Vaporeon to help him in water - based battles.
Sylveon could play a crucial role in helping Ash understand the Fairy - type Pokémon better. Since Ash has experience with various types, having a Sylveon could expand his knowledge. For instance, Sylveon could show Ash how Fairy - type moves interact with other types in different ways, which would be useful in battles and strategizing.
Well, perhaps Pikachu would go on a heroic quest to rescue Ash. It might team up with other Pokémon like Charizard. They could follow the kidnappers' trail, facing various challenges along the way, like battling wild Pokémon or getting through difficult terrains.
Well, Eevee could be in a contest. As it shows off its moves, it wags its tail. The judges are charmed by this cute display, and it helps Eevee win the contest. This would be a simple yet engaging fanfiction plot.
Well, if Ash turns into a Pokemon in a fanfic, he might gain new abilities. For example, he could use Pokemon moves like Pikachu's Thunderbolt. He'd also have a different perspective on the Pokemon world. Maybe he'd understand their language better and be able to communicate with them more easily. This could lead to new adventures where he teams up with other Pokemon in ways he couldn't before.
One possibility is that Ash would be a bit of a star at the Pokemon school. Since he has so much experience traveling and battling. He could inspire other students to be more adventurous with their Pokemon. Also, there could be some unique Pokemon species that are only studied at the school which Ash gets to interact with.
Well, in the fanfic, Ash might take Snivy to a special training ground where Snivy discovers new ways to use its vines for both attack and defense. This could lead to Snivy evolving faster than normal. And as they travel, they meet other trainers with different starters, and there could be friendly competitions that further strengthen the bond between Ash and Snivy.
In such a fanfic, Ash might catch Latias using his usual determination and battle skills. Maybe he first encounters Latias when it's in trouble, like being chased by some bad guys or trapped in a dangerous situation. He would then use his Pokémon team to protect it and gain its trust over time. Eventually, with a well - executed Pokéball throw, he catches Latias.