One option is a group of Team Rocket - like villains. They see Misty as a threat to their plans, so they hypnotize her to disrupt her normal activities. They might use a high - tech device to do the hypnosis. Another idea is that it could be a Pokémon with psychic powers that has gone rogue. This Pokémon doesn't understand the consequences of its actions and hypnotizes Misty accidentally while trying to communicate with her.
Perhaps it's a mysterious old man who has a grudge against Misty's family. He hypnotizes Misty as part of his revenge plan. Or it could be a dark - type Pokémon that has a special ability to hypnotize. This Pokémon might be lurking in the shadows, waiting for the right moment to hypnotize Misty when she's alone. It could also be a mad scientist - type character who is conducting strange experiments on trainers and uses hypnosis on Misty to study her reactions.
One interesting plot could be that Misty is hypnotized by a mysterious Pokémon trainer who wants to use her knowledge of water Pokémon for his own gain. He hypnotizes her into leading him to rare water Pokémon habitats. Another plot might involve Misty being hypnotized to forget her friends and her love for Pokémon training, and her friends have to find a way to break the hypnosis. Maybe a new villain uses a special device to hypnotize Misty and make her battle against her will in Pokémon battles.
Maybe it's a new character that has a special power of hypnosis. This character could be from a far - off region and has come to Alola specifically to study Lillie because they sense something special about her. They hypnotize her not out of malice, but out of scientific curiosity, to understand her connection to Pokemon better.
Well, there could be an evil scientist in the fanfiction. This scientist might be researching the power of hypnosis on Pokemon trainers and sees Iris as a perfect test subject. They would use their advanced technology and knowledge of Pokemon behavior to hypnotize her. Also, a powerful psychic - type Pokemon that has gone rogue could be an antagonist. It might hypnotize Iris to do its bidding, like stealing other powerful Pokemon or causing chaos in Pokemon battles. And don't forget about a group of treasure hunters who want to use Iris's hypnotized state to find a hidden treasure that only she knows the location of through her adventures.
Obviously, Hilda is one of the main characters. Since she is the one being hypnotized, the story likely revolves around her experiences and how she copes with the situation.
Misty's Pokemon could be involved in a way where they are all captured by Team Rocket. Then Misty has to rely on her wits and some basic Pokemon - handling skills without her actual Pokemon. She has to find a way to free them. Meanwhile, her Pokemon are trying to communicate with other wild Pokemon in Team Rocket's base to create a sort of uprising. This would lead to a big showdown where Misty and her freed Pokemon take on Team Rocket and their own captured Pokemon.
Perhaps she is hypnotized into believing she is in a different world or time. This could lead to her having to re - learn about the real world and her role in it when she starts to break free. It could be an adventure where she has to figure out how to get back to normal while still being in this half - hypnotized state.
It could be a rogue Team Rocket member. Maybe they got their hands on a powerful new device that was meant to capture Pokemon but malfunctioned when aimed at Misty and turned her into stone instead. Now they're trying to cover up their mistake and keep Ash and the others from finding out the truth.
The story could start with Ash being influenced by the love and commitment he sees around him in the Pokemon world. He starts to see Misty in a new light, not just as a friend and fellow trainer. As he plans the proposal, he might recall all their shared memories, from their first meeting to their latest adventures. He could take Misty to a place filled with their memories, like an old Pokemon gym they once visited together, and there, with heartfelt words, propose to her.
One possible plot could be that Ash and Misty get separated during a battle with a powerful Pokemon. When they finally reunite, overcome with relief and the realization of how much they mean to each other, they share a kiss. This would be a moment of high emotion.
Well, they might have a friendly chat about their past adventures. Maybe they'll share stories of the Pokémon they caught and the battles they fought together.