Who could be the one betraying Ash and Brock in 'pokemon ash and brock betrayed fanfiction'?

One possible plot could be that within the fanfiction world, there is a new character introduced who seems to be a great ally at first. This character gains the trust of Ash and Brock over time. However, this new character has a hidden agenda. They might be from a rival region and their goal is to undermine Ash and Brock's reputation in the Pokemon world. So they start spreading false rumors about them and turn other trainers against them, thus betraying their new - found friendship.

For Ash, Pikachu is always a great choice as it's his most loyal and powerful partner. Alongside that, a strong flying type like Charizard could be useful. For Brock, his Onix would be a staple. And perhaps a water - type like Vaporeon could be good for him to balance his team. Since they are teaming up, having a psychic - type like Alakazam could also be beneficial as it can help in battles and also with communication in tricky situations.

One possible plot could be that Ash and Brock are lured into a false sense of security by a powerful new trainer. This trainer seems friendly at first but then secretly uses their Pokémon to undermine Ash and Brock during important battles. Ash and Brock might start to suspect something when their Pokémon keep getting mysteriously weakened. Eventually, they realize they've been betrayed when the trainer reveals their true intentions of trying to take over their region's Pokémon league.

Team Rocket could always be the main antagonists. They might have a new and more devious plan to steal Ash's Pikachu and other rare Pokemon that Ash and Brock encounter on their journey.

Friendship is a very common theme. Brock and Ash have a strong bond in the Pokemon series, and fanfictions often explore and expand on that. Another common theme is growth, both as trainers and as individuals.

Adventure is also quite common. They could go on a journey together that's different from the ones in the original story. Maybe they discover a new region full of unique Pokemon and have to work together to overcome obstacles there. Sometimes, these adventures also involve them helping each other grow as trainers. Another theme is loyalty. Fanfictions might show how Brock is always there for Ash, and vice versa, no matter what difficulties they encounter, like when Ash is in a tough battle and Brock provides crucial support.

It could be a jealous fellow trainer. There are always those in the Pokémon world who envy the skills and achievements of others. This trainer might see Ash and Cynthia as obstacles to their own glory and decide to betray them to get ahead.

Well, a plot could be that Ash and Brock discover an ancient Pokemon artifact that has the power to temporarily boost a Pokemon's strength exponentially. However, a villainous team also wants it. So they have to protect it while also trying to understand its true nature. Or, they could be on a journey to a far - off island where a rare type of Pokemon lives, but on the way, they face all sorts of challenges like bad weather and other trainers who are also after the same Pokemon. Also, a story where they meet a young trainer who is very much like Ash was when he started, and they take it upon themselves to mentor the kid.

There's a fanfiction called 'Brock and Ash: Unseen Bonds'. In this one, it focuses on the quieter moments between them. It shows Brock being a mentor to Ash in ways that are not always obvious during their regular adventures. It also has some interesting side - stories about the Pokemon they encounter along the way.

A popular one is 'Ash and Brock: A Different Path'. In this fanfiction, they go off on an unexpected adventure that tests their friendship. It's full of action and also some heart - warming moments as they rely on each other to get through tough situations.