Another potential rival could be a young prodigy named Lily. She has a diverse team of Pokemon that she has trained from a very young age. Lily is very confident in her abilities and constantly tries to outdo Phoebe in battles. She might also have some unique training methods that Phoebe has to figure out in order to defeat her.
There could also be a mysterious trainer who appears from time to time. This trainer has a very powerful and rare Pokemon that Troy is intrigued by. Their battles would be intense as Troy tries to figure out the mystery trainer's strategies.
A rich and spoiled trainer who has access to all the latest Pokemon gear and rare Pokemon could be a rival. This person might look down on Cameron at first but later realizes Cameron's true strength. There could be a lot of tension and competition between them.
Gladion could be a great rival for Serena. He has a very different approach to training and battling compared to her. His edgy style and his strong Pokemon like Silvally would pose a real challenge to Serena.
Gary could be one of his rivals. Gary has always been competitive with Ash. Another potential rival could be a new character introduced in the fanfiction, someone who is really good at Pokemon battles and wants to prove himself better than Ash.
One potential rival could be a male trainer who has a more traditional view of Pokémon training and looks down on the fem Ash's different approach. He might constantly try to one - up her in battles.
Sasuke could be a potential rival. He is highly talented and always striving to be stronger. His determination and different fighting style would make for an interesting contrast to the Nara prodigy.
One potential rival could be another boy who has a crush on Liv. He might see Holden and Liv getting closer and try to interfere with their relationship. Maybe he spreads rumors or tries to make Holden look bad in front of Liv. Another rival could be a girl who likes Holden. She could be jealous of Liv and try to come between them by flirting with Holden and making Liv feel insecure.
John Cena could be a great rival. He is a well - known and respected WWE superstar with a large fan base. A rivalry between him and Tiger Mask W would be interesting as they have very different styles. Cena's power moves against Tiger Mask W's high - flying and technical moves would make for some exciting matches.
There could be a rival who is from a wealthy and well - connected fashion family. They have all the resources and connections but lack Harry's raw creativity. So, they view Harry as someone they need to squash to maintain their family's dominance in the fashion world. This rival might use their family's influence to get better show venues or exclusive fabric deals, leaving Harry at a disadvantage.
There are quite a few potential rivals. For example, Paul could be one. He has his own unique battling style and might be intrigued by Ash's Alola - champion ways. Then there's Trip. He could see Ash as a target to boost his own reputation. And in Alola itself, some of the more ambitious students from the Pokémon school who are aiming to be the best might also become rivals, constantly challenging Ash to prove they are worthy.