In the fanfic, Ash could be camping in the wild. He's trying to cook some food and makes a mistake while handling the fire. The fire jumps onto his butt. His Pokemon are all startled. Some of the smaller Pokemon like Pidgey might fly around in a frenzy. But then, his more experienced Pokemon like Snorlax could roll over Ash's butt to put out the fire.
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, if Ash has his butt on fire in a fanfic, it might be because he got too close to a Fire - type Pokemon's nest. The angry Pokemon mother might have attacked him. His Pokemon friends would have to work together. Squirtle could use Water Gun to extinguish the fire, while Ash is learning a lesson about respecting the territory of other Pokemon.
One possible fanfic could be that Ash accidentally sits on a hot Pokeball which causes his butt to be on fire. He then runs around in a panic while his Pokemon try to figure out how to put the fire out. Pikachu might use Thunderbolt but that just makes things worse by electrifying Ash as well.
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 a Pokemon fanfic where Ash trades Pokemon, a lot of interesting things can occur. He might trade a Pokemon that has been with him for a long time, like Pikachu. This could lead to a whole new adventure as he gets to know the new Pokemon he received. It could also change his battle strategies.
Well, it might be that his rivals in the fanfiction somehow manage to deceive his Pokemon into thinking Ash is a bad trainer. Maybe they spread false rumors about how he doesn't really care for them, which causes the Pokemon to betray him. This would shatter Ash's world as his Pokemon are his closest friends and partners.
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.
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.
Ash joining Team Rocket could lead to some interesting character dynamics. He might start to question his own values. For instance, he's always been about friendship with Pokemon, but Team Rocket is more about using them for gain. This internal conflict could be a major part of the fanfic. Also, his relationship with Jessie, James, and Meowth would change drastically.
Imagine a scenario where Ash is in a different dimension or a special realm where the rules of Pokémon catching are a bit different. He meets Ho - Oh there, and instead of using a traditional Poké Ball, he has to use a special item or perform a unique ritual. This would make for a very interesting and unique fanfic as it deviates from the normal Pokémon - catching methods we are used to.