One possibility is that Pikachu's discovery of Ash's Pokemon instincts leads to a new training method. Since Pikachu realizes Ash has this special understanding, they could work together to train the other Pokemon more effectively.
Well, in the fanfiction, Pikachu could notice Ash's Pokemon instincts when they encounter new and rare Pokemon. Ash might react in a way that indicates he has an instinctive understanding of how to approach or deal with these Pokemon. This could be because of his past experiences, but it also might be a sign of his evolving Pokemon - related instincts. Pikachu, being so attuned to Ash, would immediately sense this change in him and be intrigued by it.
Well, he might start to see the world from a Pikachu's perspective. For example, he would experience the small size and how everything looks so huge. He could also find it difficult to communicate with his human friends in the normal way since he is now a Pikachu. Maybe he would have to rely on Pikachu's ways of expressing emotions like using electrical signals.
In some fanfictions, Pikachu could inherit Ash's dream. Ash had a big dream of becoming a Pokemon Master, and Pikachu might take up that mantle in a way. It could start traveling to different regions, challenging strong trainers, all while carrying the memory of Ash with it. This would show how much Ash influenced Pikachu during their time together.
In the 'Ash becomes a Pikachu fanfiction', Ash could have dreams where he is actually a Pikachu. This could lead to some really interesting adventures. For example, he wakes up in a dream as a Pikachu and has to figure out how to use his new form to battle. He might also make new Pikachu friends in his dream world and learn their unique ways of living. This could then have an impact on how he treats Pikachu in the real world when he wakes up, like being even more protective and affectionate towards his beloved Pikachu.
Well, Ash would be devastated. Pikachu has been his closest companion throughout his Pokémon journey. He might go on a desperate search for Pikachu, traveling to all the places they've been together. This could lead to Ash encountering new Pokémon and trainers along the way.
Perhaps in this fanfiction, Ash meets Pikachu not as a novice trainer but as someone who has already had some basic training knowledge. So when he meets Pikachu, he is more confident in approaching it. He might even have some special items with him that help him bond with Pikachu faster, like a unique type of Pokéball or a charm that Pikachu is attracted to. This would change the dynamic of their relationship from the very beginning compared to the official story.
Well, perhaps Ash starts to idolize Pikachu after seeing its unique powers in a battle. He might try to imitate Pikachu's moves and even start collecting Pikachu - themed items.
One possibility is that Ash has to quickly adjust to Raichu's new power levels. Raichu might be a bit more independent compared to Pikachu, which could lead to some initial clashes in their teamwork. But in the end, they could become an even more formidable team, with Raichu's increased strength allowing them to take on tougher opponents in battles.
In this kind of fanfiction, Ash might find it really hard at first. He's used to being a human trainer, and suddenly becoming a Pikachu would be a shock. He'd have to learn how to control Pikachu's electric powers which he only used to command before.
In 'pokemon ash saved by pokemon fanfiction', it's possible that Ash gets into a situation where he's lost in an unknown and dangerous area. The Pokemon fanfiction might have his favorite Pokemon, like Pikachu, using some unexpected abilities or getting help from other friendly Pokemon to save Ash. For example, Pikachu could team up with a group of local Pokemon who know the area well and they guide Ash out of danger while also protecting him from any threats along the way.