One possible storyline could be Serena feeling heartbroken and then deciding to focus on her own Pokemon journey independently. She might strive to become a better Pokemon trainer on her own terms, proving herself not just for Ash but for her own self - worth.
Another storyline could be that Serena, after being rejected, tries to understand why Ash rejected her. She could analyze their past interactions and realize that they were more like friends all along. This realization could lead her to redefine their relationship in her mind and focus on building a stronger friendship with Ash while also forging her own path in the Pokemon world.
One possible storyline could be that Ash is a knight in training and Serena is a noble lady. Ash has to prove his worth in a jousting tournament to win Serena's hand in marriage. Another could be that they are both on a quest to find a magical Pokemon that is said to have the power to save the medieval kingdom from an evil sorcerer. And a third could be that Serena is a healer and Ash is a warrior, and they team up to fight off a horde of dark - type Pokemon that are attacking the villages.
One popular storyline could be Ash and Serena starting at a new Pokemon school together. They might face challenges like dealing with a strict teacher who doesn't believe in Ash's unorthodox training methods. Another could be a school competition where they team up against rivals. It could also involve Serena trying to start a Pokemon - related club at school and Ash being her biggest supporter.
A great storyline could be that Serena decides to start a new Pokemon performance group in Alola, and Ash helps her recruit members. They could travel around the Alola region, looking for Pokemon and trainers with special talents in performing. This would not only bring a new aspect to their relationship but also introduce new characters and Pokemon to the story.
Obviously, Ash and Serena are the main characters. Ash is the one doing the rejecting, and Serena is the one facing that rejection. Their relationship dynamic forms the core of the fanfiction.
A possible storyline could be that Misty and Serena accidentally find out about each other's feelings for Ash. So, they start a friendly competition where they try to do things that would make Ash notice them more. For example, Serena might practice harder for her Pokémon performances, and Misty could train her Pokémon to be even stronger to impress Ash.
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.
One way is through words. Ash might say things like 'Serena, you're one of the strongest people I know. Don't let this get you down.' Just simple, sincere words of affirmation.
Some fanfics focus on the relationship between Serena and Ash. They might write about how Serena finally confesses her true feelings to Ash in a really emotional and romantic way. There could also be a storyline where they get separated and have to find their way back to each other, facing many challenges along the way which test their bond.
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.
One possible storyline could be that they are in a dangerous situation in a new region. While running away from a powerful Pokemon, Ash reaches out and grabs Serena's hand to ensure she doesn't get left behind. This moment of physical contact could mark a new level of closeness in their relationship, and as they escape, they start to have deeper conversations about their feelings for each other.