Perhaps he defeats some of the Elite Four members who are participating in the league. They are known for their strength, so it would be a huge accomplishment. And of course, any recurring rivals from his past adventures like Trip or Paul.
In the fanfiction, he might also face off against some international trainers who have come to compete in the Pokémon League. These trainers could have Pokémon with unique abilities and fighting styles. Ash would have to use all his skills and knowledge to defeat them on his way to winning the league.
One idea could be that Ash's victory in the Alola League is due to his strong bond with his Pokémon. His Pikachu, for example, could have evolved a new move during the final battle that gave them the edge. Another idea is that Ash's experience from all his previous regions finally culminates in this victory, and he uses strategies he learned along the way.
In the Unova League in the Pokemon series, Ash winning is quite an exciting concept in fanfiction. It shows his growth as a trainer. Maybe in this fanfiction, he finally overcame all his opponents with his strong team, strategic thinking and unwavering determination.
He could defeat Trip. Trip is a well - known character in the Unova region. Ash might have finally outsmarted Trip in a battle with his Pikachu's speed and powerful electric attacks.
The fanfiction might start with Ash feeling more determined than ever. He could go on a journey to find rare Pokémon or special items to boost his team. Along the way, he faces many challenges and meets new trainers. In the Pokémon League, he uses his experience from all these encounters. His Pokémon's diverse movesets and his own quick thinking in battles lead him to victory.
His toughest opponent could be Gary. Gary has always been a rival to Ash and has a strong and diverse team of Pokemon. Their battle would be intense as they both know each other's battling styles well.
Gary could be one of his rivals. Gary has always been competitive with Ash. Another potential rival could be a new character introduced in the fanfiction, someone who is really good at Pokemon battles and wants to prove himself better than Ash.
The fanfic about Ash winning the Alola League is great. Ash winning is a big deal as it shows his development as a trainer. In the Alola region, he faced many challenges, and to overcome them and win the league is a huge achievement. The fanfic probably delved deeper into the emotions of Ash and his friends during the league battles, making it a more immersive experience for the readers.
In the 'ash wins the kalos league fanfic', Ash might face off against some of the Elite Four of Kalos in the league. These trainers are known for their expertise and powerful Pokémon teams. Also, there could be a young prodigy trainer who has been making waves in the Kalos League circuit. This trainer could have some unique and newly discovered Pokémon that Ash has to figure out how to battle against. Additionally, there might be a trainer who specializes in a type of Pokémon that Ash's team is weak against, creating a challenging battle for him.
Ash might gain more recognition. In the Pokemon world, winning a league is a big deal. So, he could be invited to exclusive Pokemon events. For instance, he could be asked to give a speech at a Pokemon training seminar.
Gary could also be important. Maybe in this fanfiction, Gary is a rival that Ash has to outwit and defeat in a more intense way compared to the original story. Their rivalry could be a major driving force for Ash's growth and success in the league.