One possible scenario could be that Ash betrays May for a powerful Pokemon. Maybe he gets offered a super rare and strong Pokemon but has to cut ties with May to get it. Another could be that May betrays Ash because she is influenced by a rival trainer who convinces her that Ash is holding her back from reaching her true potential as a Pokemon trainer.
Well, in the fanfiction, it might be that Ash betrays May due to some misinformation. For example, if he hears false rumors about May working with an evil team. As for May betraying Ash, perhaps she discovers a new training method that goes against Ash's beliefs and decides to side with a group that promotes that method, thus betraying Ash in the process.
In this fanfiction, there could be a situation where Ash betrays May out of jealousy. Maybe May has achieved some great success with her Pokemon and Ash, feeling overshadowed, makes a deal with someone that goes against May's interests. On the other hand, May could betray Ash if she falls for the lies of a character who wants to use her to get to Ash. This character might make her believe that Ash has some dark secrets and that she should distance herself from him.
In certain fanfiction stories, Ash could faint as a result of a psychological shock. Imagine if he discovers that one of his beloved Pokemon has been mind - controlled by an evil organization. The sheer horror and disbelief could be so overwhelming that he faints. Additionally, he might be caught in a powerful psychic attack from a very strong psychic - type Pokemon that not only weakens his physical state but also his mental state, leading to his fainting.
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.
Perhaps a new and powerful trainer arrives in the story. This trainer manages to deceive Ash's harem members, making them think that Ash is a hindrance to their growth as trainers. As a result, they side with the new trainer and betray Ash, leaving him feeling confused and alone.
In addition to Ash's friends, there could be some villains in the fanfiction. They might be the ones who initiate the betrayal. For example, some Team Skull members could play a role. They might manipulate the situation to make Ash's friends believe that he is not trustworthy. Also, some mysterious new trainers in Alola could be involved, either as instigators or as characters who try to help Ash later.
Betrayal could also stem from a misunderstanding. Maybe Ash or Cynthia accidentally offend someone without realizing it. For example, they might unknowingly step on a trainer's dreams or beliefs. And that trainer, feeling deeply hurt, decides to betray them. Or it could be that a Pokemon they both have a connection with has a different loyalty that they were not aware of, which leads to the Pokemon causing their betrayal.
Perhaps in the fanfiction, there's a threat to the Pokemon world. Ash and May team up to face it. During their adventure, they rely on each other, share their hopes and fears. This mutual understanding and support lead them to a realization of their love for one another. And in the end, they plan to get married to build a future together in the Pokemon world.
One possible scenario could be that all their Pokémon friends are part of the wedding. Pikachu might be the ring - bearer, with little ribbons on its ears. Another scenario is that they have the wedding on a beach near a Pokémon Center. Ash could be wearing a traditional tuxedo, and Misty in a beautiful white dress with a water - type Pokémon motif.
One possible scenario could be that Ash and Serena are at a Pokemon festival. The music starts and they begin to dance. Ash, who is usually more focused on Pokemon battles, is a bit clumsy at first but Serena guides him. As they dance, their Pokemon join in the fun, creating a lively and heartwarming scene.
It could be that Mew has some sort of special power or knowledge that certain groups in the Pokémon world are after. They see Ash as an obstacle to getting what they want from Mew. So, they scheme to make everyone think Ash is untrustworthy. His friends, not knowing the truth, end up betraying him. Ash then has to fight against all odds to protect Mew and regain the trust of his friends.
One possible plotline could be that her so - called friends in the Pokemon journey turn against her for some reason, like jealousy over her Pokemon's strength. Maybe they try to steal her Pokemon or spread false rumors about her to isolate her.