Well, a plot might involve Leaf betraying Ash because she becomes jealous of his growing bond with a new Pokémon trainer. She feels left out and in a moment of weakness, she gives away Ash's battle strategies to his opponents. Or perhaps, Leaf is deceived by a false prophecy that says Ash will bring doom to the Pokémon world, so she tries to stop him by betraying their friendship.
Perhaps Leaf betrays Ash because she becomes jealous of his friendship with Pikachu. She might feel like Pikachu gets all of Ash's attention and decides to side with a group that wants to separate them. This could lead to Ash having to fight not only to save Pikachu but also to win Leaf back.
The betrayal in the fanfiction could have a big impact on the Pokémon world. Ash has many Pokémon friends and allies. If Leaf betrays him, it could lead to some Pokémon being captured or in danger. Also, the bond between humans and Pokémon might be affected as it could make some Pokémon lose trust in humans if they see such a big betrayal between two well - known trainers.
In 'pokemon ash x dawn betrayed fanfiction', it could be that Dawn betrays Ash for personal gain. For example, she might be tempted by a powerful trainer or organization that offers her something she desires, like a rare Pokemon or a chance to become a more famous trainer. This betrayal could lead to Ash feeling heartbroken and confused, and it might set off a series of events where he has to deal with his emotions as well as the consequences in his Pokemon journey. It could also involve their friends and other Pokemon getting involved in the aftermath of this betrayal.
One interesting plot idea could be that Leaf and Blue team up to explore a new, mysterious region filled with undiscovered Pokemon. They face challenges together and their relationship evolves from rivals to friends.
It could be that Lillie betrays Ash because she believes it's the only way to achieve a greater good in the Pokémon world. She might think that Ash's methods are too dangerous or not in line with what she believes is right for the future of Pokémon and humans alike. This would create a complex conflict between their ideologies.
One idea could be that Natsu is betrayed by his closest friends in the guild, and in his time of despair, a group of female characters form a harem around him to help him heal and regain his confidence. For example, Lucy could be the first to reach out, using her celestial magic to show him there are still things to fight for. Another plot could involve Natsu being betrayed by a powerful dark mage who manipulates his guild against him. The harem, which might include Erza, Wendy, and others, then trains Natsu in secret to become stronger and take revenge on those who wronged him.
Maybe a plot where Ash gets lost in a strange region and Gladion is the one who finds him. Gladion then helps Ash navigate through this new place. In the process, they encounter various challenges and secrets of the region. Their shared experiences and the way they rely on each other through these difficulties lead to a romantic relationship between them. This kind of plot can be full of mystery and discovery, as well as the growth of their relationship.
One idea could be that Ash and a Pokegirl team up to save a special Pokémon that has the power to heal a dying ecosystem in the Pokémon world. During their journey, they gradually develop feelings for each other. Another could be that in a world where Pokegirls are often discriminated against, Ash befriends a Pokegirl and helps her prove that they are just as capable as trainers. This could lead to a romantic relationship.
One idea could be a crossover where the characters from Pokemon X meet those from Leaf Green in a world filled with lemon trees. The lemons could have special powers related to Pokemon types, like Fire - type Pokemon getting a boost near lemon trees that have a spicy essence. Another plot could involve a mystery where rare Pokemon are disappearing and the only clue is a lemon - scented mark left behind. This would lead the trainers on an adventure across both regions.
I'm not entirely sure specifically about this 'evil ash betrayed fanfiction' as there could be many different interpretations. It might involve the character Evil Ash in a situation where he betrays someone or something within the context of the fan - created story.