In this fanfiction, it could be a mysterious figure who has been secretly observing Ash and Brock all along. This figure might be from an ancient Pokemon - worshipping cult. They betray Ash and Brock because they see their presence as a threat to their long - held beliefs and practices regarding Pokemon. They might use underhanded tactics like stealing their Pokemon or spreading lies to turn the Pokemon community against them.
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.
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.
Well, in many ash and brock fanfictions, the theme of loyalty is prominent. They are loyal to each other through all their adventures. Also, the theme of discovery, both in terms of new Pokémon and new places. Fanfictions might also touch on the theme of facing fears, as they encounter various dangerous situations together and have to rely on each other to overcome them.
Typically, these fanfictions often emphasize the friendship among them. They show how they support each other in battles and during their travels in the Kalos region.
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.
Archive of Our Own (AO3) is also a great place. There are many well - written Ash x Brock fanfictions there. You can search for them using the tags related to the Pokémon series, Ash, and Brock.
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.
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.