Well, one interesting plot could be Ash forming unique friendships with different Pokemon in the school setting. For example, he might discover a new Pokemon with special abilities and help it overcome its shyness. Another plot could be the various competitions and challenges within the school that Ash and his friends participate in, like a Pokemon battle tournament where they have to strategize and use their Pokemon's skills to win.
One interesting plot could be Ash forming a unique bond with each Pokémon in his harem. For example, he might have special training sessions with different Pokémon that are tailored to their individual strengths and weaknesses.
In some 'pokemon ash harem journey fanfiction', there might be a plot where the girls in Ash's harem team up to help him in a particularly tough Pokemon battle. They use their unique skills and the Pokemon they've caught to support Ash, and this could lead to a strengthening of their relationships with him. Also, a plot could involve a new girl joining Ash's harem and causing some jealousy among the existing members, creating interesting relationship dynamics.
One interesting plot could be Ash and Cynthia teaming up to take on a powerful, new and mysterious Pokemon that threatens the region. They combine their skills and knowledge to figure out its weaknesses.
One interesting plot could be a trainer who accidentally stumbles upon a hidden realm where legendary Pokemon reside and they all develop a special bond with him, forming a harem. Another could be a story where a young researcher is chosen by the legendary Pokemon to be part of their world and ends up in a harem - like situation due to their unique connection.
One interesting plot could be Ash trying different Pokemon foods that cause unexpected weight gain. For example, he might taste a new type of Poke - Puff that has a strange side effect on his metabolism. Another plot could be that a certain Pokemon's ability accidentally affects Ash, making him gain weight gradually. Maybe a psychic - type Pokemon's power goes awry and messes with Ash's body composition.
Obviously, Ash is one of the main characters. He is the central figure around whom the story revolves. Then there are the members of his harem, though without knowing the specific fanfic, it's hard to name them exactly. But usually, they would be characters who have a special connection with Ash, whether it's through Pokemon battles, shared interests in Pokemon research, or just being good friends.
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.
One common plot is that Ash's friends or some of the female characters in his harem turn against him due to a misunderstanding. Maybe they think he has some ulterior motives or has betrayed their trust in some way. Another plot could be a new character coming in and manipulating the situation to make it seem like Ash is the bad guy.
One popular 'pokemon ash and harem fanfic' might be those where Ash has adventures with a group of female Pokémon trainers. In some stories, they travel together through different regions, and the female characters often have unique relationships with Ash, like helping him in battles and sharing their Pokémon knowledge.
One interesting story could be about Ash forming unique bonds with both humans and Pokemon in the harem. For example, he might go on adventures with a group of human friends and their Pokemon partners, where they face challenges together and learn from each other.