In a fanfiction about Ash born in 1987 and his situation in 1997, we could see an alternate story where Ash is not the typical rookie trainer. Since he's a bit older than in the original, he might be more knowledgeable about Pokémon lore. He could be on a quest to uncover some ancient Pokémon secrets in 1997. He might travel to different regions, not just for battles but also to study old Pokémon texts and artifacts, and along the way, form an unusual team of Pokémon that are attracted to his in - depth knowledge.
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.
In this fanfiction, Gary might be an important character too. He could be a rival from the very beginning, with both of them having different approaches to Pokémon since Ash was born into it. Professor Oak would also be a main character as he could be the one to discover Ash's unique connection to Pokémon and help him on his journey.
In a fanfiction, Ash might have a special bond with Latios. Maybe Latios senses Ash's pure love for Pokemon and decides to team up with him. They could go on adventures, facing powerful foes together. Ash could learn new techniques from observing Latios in battles.
Ash could be a transfer student in the Pokemon school. He'd be excited to learn new things. He might join a special class focused on rare Pokemon. His Pikachu would be his constant companion, and they'd get into all sorts of fun and mischief in the school hallways.
Well, in an 'ash the pokemon fanfiction', it might center around Ash's growth as a Pokemon trainer. It could include him facing challenges that are different from the original series, like dealing with a powerful new villain who has a unique way of using Pokemon. It could also show Ash's relationship with his Pikachu evolving in new and interesting ways.
Their relationship would likely grow closer. At the dance party, Ash might be a bit clumsy at first, and Serena would gently guide him, which would create some sweet and tender moments between them. They would share laughter and maybe some embarrassed blushes as they interact more intimately during the dance, deepening their bond.
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.
There are also fanfictions where Ash catches Rayquaza. This could be set during a time when the sky is in chaos due to some dark energy. Rayquaza is drawn to Ash because of his pure heart and determination. Ash, with his usual courage, teams up with his pokemon to assist Rayquaza in restoring balance. As a result, Rayquaza allows Ash to catch it.
Maybe in this fanfiction, Ash is born with a special Pokémon ability. This could lead to a plot where he has to hide this power at first because others might misunderstand or be jealous. It could also attract the attention of some evil organizations who want to use his power for their own gain.
Another storyline could be how Ash's birth year affects his relationships with other characters. Maybe in this fanfiction, being born in 1987 means he has a different dynamic with Misty. Since they are from different generations in a sense, it could lead to some interesting conflicts and reconciliations. He might be more traditional in his Pokemon training methods compared to some of the younger trainers he meets, which could also create storylines about the evolution of training styles.