I'm not sure of a specific one off the top of my head, but you can try searching on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just type in 'Ash dark aura' in the search bar and you'll likely find some interesting reads.
One great aspect of Aura Guardian Ash fanfiction could be the exploration of Ash's latent aura powers. Maybe in these stories, Ash discovers he has a much deeper connection to the aura realm than he ever knew. This could lead to him having new abilities and forming unique bonds with Pokémon that are also attuned to the aura.
Ash can be developed by showing his struggle with the Dark Aura. If it starts to influence his decisions, like making him more aggressive in battles or more distant from his friends. He has to constantly fight against these negative impulses, which can show his inner strength. Also, exploring his fear of losing control to the Dark Aura can add depth to his character.
Well, a plot could revolve around a new villain who has the ability to manipulate the Dark Aura. This villain targets Ash because of his strong bond with his Pokémon. Ash then has to explore the origin of the Dark Aura to find a way to defeat this new threat. He might encounter ancient Pokémon along the way that have knowledge about the Dark Aura. And as he delves deeper, he discovers secrets about his own connection to this powerful force.
It could be that there is a young, impressionable character who looked up to Ash Aura. After the betrayal, this character is confused and starts to question his own beliefs. There might also be a powerful mage in the story who has the ability to see the truth behind Ash Aura's actions and is trying to prevent the chaos that the betrayal has caused.
One interesting fanfiction could be where Ash discovers a hidden power within himself that gives off a dark aura. In this story, he might struggle to control it at first. Maybe his Pokémon are initially scared of this new energy but then they learn to adapt and help him master it.
I'm not entirely sure specifically what 'ash uses aura fanfiction' is about without more context. It could be a fan - made story where the character Ash makes use of aura in some way that's different from the original source material.
In a fanfiction, Ash and Serena might explore their auras together. Serena, having a more refined sense of aura, could teach Ash how to better control and understand his. This could lead to a series of adventures where they use their auras to communicate secretly and solve mysteries in the Pokemon world.
It depends on your personal taste. If you're a big fan of the Aura Guardian concept and like stories centered around Ash, it could be a great read. Some fanfictions really capture the essence of the characters and expand on the lore in interesting ways.
There's no canonical indication that Ash uses his aura abilities to see fanfiction. Fanfiction is a concept within the fan community, not something directly related to the in - universe powers in the Pokémon world.