One possible rival could be a cocky young trainer named Max who thinks he's better than both Ash and Giselle. He always tries to one - up them in Pokemon battles. Another rival could be an experienced trainer named Lily. She has a collection of rare Pokemon and is constantly challenging Ash and Giselle to prove her superiority. There could also be a team of two rivals, Jack and Jill. They work together to try and outwit Ash and Giselle in any Pokemon - related competition.
Well, a likely rival character could be a trainer named Rico. He has a special Pokemon that gives him an edge in battles, and he's very competitive towards Ash and Giselle. Another one might be a girl named Mia. She has a deep knowledge of Pokemon types and uses that to her advantage against them. Also, there could be a mysterious trainer in a black cloak who shows up from time to time to challenge Ash and Giselle. This trainer has some very powerful and unusual Pokemon that make the battles very difficult for them.
One possible theme could be adventure. They might embark on a journey together, facing various challenges and obstacles. Another theme could be friendship, showing how they support and care for each other. Also, a theme of self - discovery might be present, as they learn more about themselves through their interactions with each other.
One plot idea could be that Ash and Giselle team up to explore a new, mysterious region filled with never - before - seen Pokemon. They encounter various challenges along the way, like difficult terrains and strong wild Pokemon. Another idea is that Giselle has a special ability that only Ash can help her control, and together they use it to save a Pokemon sanctuary from an evil organization. A third idea might be that Ash gets lost in a time - warp and Giselle has to follow him into the past or future to bring him back, all while facing different versions of Pokemon from different eras.
There are also those where Tracey, who was Ash's friend in the anime, could be turned into a rival in fanfiction. Maybe he has a change of heart or has some new motivation that pits him against Ash. Also, characters like Gladion from the Alola region can be used as rivals in these stories as they have strong Pokemon and unique personalities.
Maybe Team Rocket could have a new member who is a ninja. This new member could be Ash's main rival. They would try to steal Ash's pokemon in more sneaky and ninja - like ways. And Ash would have to use his ninja skills to protect his pokemon and defeat this new rival from Team Rocket.
Pikachu is a very likely candidate. It's Ash's most iconic Pokemon and has a deep bond with him. Whenever Ash is in trouble, Pikachu often steps up to protect him.
The fanfiction 'Ash and Giselle's Secret Alliance' is also quite interesting. It delves into how they form an alliance in a world filled with political intrigue and magic. They must keep their alliance a secret while working towards a common goal, and it shows their relationship evolving in a complex and engaging way.
In 'pokemon godlike ash harem fanfiction', Misty is an obvious choice. She has a history of traveling with Ash and sharing adventures. May, with her cheerful and determined nature, is another potential character. Serena, given her romantic feelings for Ash in the anime, is very likely to be in the harem. Dawn, who has her own charm and Pokemon - training skills, could also be part of it. Additionally, there could be new characters created specifically for the fanfiction, perhaps from unexplored regions in the Pokemon world, with unique personalities and abilities that would add to the dynamics of the harem.
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.
In fanfiction, Ash is often portrayed as brave and determined. He is the one who takes the lead in most adventures. Giselle, on the other hand, is usually depicted as intelligent and resourceful. For example, in some stories, when they are trapped in a dungeon, Giselle uses her wits to find a way out while Ash fends off any threats.
Perhaps he defeats some of the Elite Four members who are participating in the league. They are known for their strength, so it would be a huge accomplishment. And of course, any recurring rivals from his past adventures like Trip or Paul.