Perhaps a rogue Frontier Brain who has his own ideas about how the Frontier should be run. He might see Ash as a threat to his plans, especially if Ash is secretly learning so much about the Frontier Brains. This antagonist could try to sabotage Ash's journey and his secret training.
One idea could be that Ash has been secretly studying the Frontier Brains' strategies all along. He might be inspired by their unique battling styles and incorporate them into his own battles without anyone knowing. For example, he could be using techniques similar to Brandon's in his battles against tough opponents in the regular Pokemon League.
Sadly, without further details, it's impossible to determine the creator of 'ash frontier brain fanfiction'. It could be a relatively unknown writer who just wanted to share their own take on a story involving these elements. Maybe it was created by a novice writer who was experimenting with different themes and this was the result of their creative exploration.
I'm not entirely sure as it could be very specific to the person who created it. It might be a fan - made story related to a character or concept named 'Ash' in a 'frontier' setting with a 'brain' - related theme, perhaps something about Ash's mental adventures or challenges in that frontier world.
One possible scenario in this fanfiction could be Ash using his unique battle strategies in the Battle Frontier. Since he's a 'brain' here, he might outwit his opponents with complex plans. For example, he could analyze his opponents' Pokémon teams in great detail before the battle, predicting their moves and formulating counter - strategies on the fly.
Well, in fanfictions, Anabel stands out. She's not only strong but also has a certain allure. Her battles with Ash can be written in many different ways, like her psychic Pokemon having unexpected moves. Brandon is also really cool. He might be depicted as having a secret training method for his Pokemon that Ash tries to figure out during their battle. And then there's Greta. She can be an interesting character in fanfictions, especially when her fighting - type Pokemon are shown with unique abilities and personalities that test Ash's skills.
One of the main themes is the exploration of new regions. Since the Frontier is a unique area, fanfictions often focus on Ash exploring it while taking on the Frontier Brains. Another common theme is the evolution of Pokémon. Ash's Pokémon might evolve during his encounters with the Frontier Brains. And of course, the theme of perseverance is always there as Ash has to keep trying to defeat the Frontier Brains.
In 'ash is a frontier brain fanfiction', it's fascinating to see how Ash's past experiences as a trainer shape his decisions and actions as a frontier brain. His relationships with his Pokémon also take on a new dimension. For example, he might use his Pokémon in different ways for challenges related to the frontier. Also, his interactions with other trainers who come to challenge him can be really engaging, as he has to uphold the standards of the frontier while still being the Ash we know.
The plot could revolve around Ash being recognized for his strategic mind in the Battle Frontier. He could be challenged by various tough opponents who want to test his skills. Each battle would be a test of his wits, and he'd have to constantly adapt his strategies.
One popular plotline is Ash facing a particularly tough Frontier Brain with a unique and powerful Pokemon. For example, a Frontier Brain with a rare and super - strong Psychic - type Pokemon that challenges Ash's battle strategies. Another is Ash having to adapt to a new and strange battle environment during his encounter with a Frontier Brain, like a battle on a floating island. Also, some fanfictions explore the idea of Ash befriending a Frontier Brain and learning new training techniques from them.