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.
In this fanfiction, Ash might make new friends at Pokemon school. He could learn new training techniques for his Pokemon. Maybe he'll also face some tough competitions against other students.
Well, in this fanfiction, Ash might face new challenges at school. He could meet other trainers - in - training who have different views on Pokemon. Maybe there would be classes about Pokemon history and types, which Ash would either ace or struggle with, considering his hands - on experience in the wild.
In an 'Ash goes to school fanfiction', Ash might make new friends at school. He could encounter different Pokémon - related challenges in a school setting, like having Pokémon battles as part of a school competition.
They could participate in a high school Pokemon tournament. Ash would be super competitive, using his Pikachu to its full potential. May might enter with one of her cute Pokemon like Skitty. They could face off against each other in an intense battle, which would be a really exciting part of the fanfic.
In this fanfiction, Ash might make new friends in the Alola region. He could encounter unique Pokémon there that he has never seen before, like the Alola forms of some Pokémon.
Well, he may face new challenges in the trainer school. There could be tough exams on Pokémon knowledge and battle strategies. He might struggle with some theoretical parts but shine in the practical battle tests.
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, in the 'ash goes back to kanto fanfic', it could be that Ash goes back to compete in some special Kanto - only Pokémon battles. He might meet some of his old rivals and have epic rematches. He could also discover new secrets about the Pokémon in Kanto that he didn't know before, like hidden abilities or unique evolutionary paths. And of course, he would probably share his experiences from other regions with the people in Kanto.
In the fanfiction, Ash as a delinquent could start his own underground Pokemon club. It would be a place where students can come and trade rare Pokemon or learn new battle techniques that the school doesn't teach. But this would put him at odds with the school faculty, who see it as a threat to their structured way of teaching about Pokemon.
Ash could meet new friends and rivals. For instance, he might find a rival who has a completely different approach to Pokemon training. This would force Ash to reevaluate his own methods.