It could be that Ash has some past mistakes or traumas in his Pokémon journey that he is trying to escape from. Maybe he made a wrong decision during a battle that cost him a Pokémon's trust, and now he's running from the guilt. Or perhaps there are some events related to his old rivals that he wants to avoid.
It could be an older version of a previous rival. For instance, Gary could have become bitter over the years and now blames Ash for something in their shared past. So he is constantly chasing Ash, making Ash run from his past connection with Gary.
Yes, in fanfiction, the possibilities are endless. Ash could be depicted as having a great singing voice. Writers often take creative liberties in fanfiction to show characters in new and unexpected ways, so it's very likely that there are fanfictions out there where Ash sings.
In regular Pokemon fanfiction, the focus is often on Ash following the standard path of becoming a Pokemon master. However, in Ash Rogue fanfiction, his character development takes a different turn. He might be more self - reliant and take risks that normal trainers wouldn't. This deviation from the norm creates a whole new set of adventures and challenges for Ash, which is what sets it apart from regular Pokemon fanfiction.
Pikachu is a very likely candidate. It's Ash's most iconic Pokemon and has a deep bond with him. Whenever Ash is in trouble, Pikachu often steps up to protect him.
Savage Ash is often more independent. The original Ash usually travels with friends and follows the traditional path of gym battles. Savage Ash, on the other hand, might go off on his own, not caring much about the established rules. For example, he could skip gyms and focus on conquering powerful wild Pokemon.
Ash could be a Pokémon trainer with a different starting point in this fanfiction. Born in 1987, by 1997 he might have already made a name for himself in local Pokémon battles. He could have a team of Pokémon that he rescued from difficult situations, like a Charmander that was abandoned by its trainer. His story could revolve around giving these Pokémon a second chance and proving that Pokémon don't need to be 'perfect' to be strong.
The impact of Ash's loss in the fanfiction could extend beyond just himself. His Pokémon might also feel demoralized. However, this could also be an opportunity for them to grow stronger together. Ash could start training more intensively, seek new training methods, or even try to catch new Pokémon to strengthen his team.
There are also often appearances from various Gym Leaders. They can serve as either allies or rivals to Ash. For instance, a Gym Leader might challenge Ash to a battle to test his newfound power, or they could join forces with him to take on a greater evil that threatens the Pokemon world.
Well, we can expect a story centered around Ash in the Pokemon universe. It might include his adventures, his relationships with other Pokemon trainers and his Pokemon. Maybe it'll show new battles and challenges he faces.