Well, the use of old Pokémon by Ash in the Unova fanfic can have a big impact on the plot. Since his old Pokémon have their own personalities and abilities, they can change the power dynamics in battles. If Ash's powerful old Pokémon like his Greninja suddenly shows up in a Unova battle, it can turn the tide. Also, their presence can attract the attention of different characters in the Unova region. Some might be curious about these foreign Pokémon, while others might see them as a threat. This can lead to all sorts of interactions, from friendly exchanges to full - blown conflicts, which are essential elements for a rich and engaging plot in the fanfic.
It could be for nostalgia. Ash has a long history with his Pokémon, and using the old ones in a Unova fanfic might be a way to bring back memories for the readers who have followed his journey from the start. It also shows his growth as a trainer, as he can rely on the skills and bonds he's developed with his older Pokémon in a new region.
He might use them because they are his tried and true companions. Ash has a strong bond with his old Pokémon, and in the Kalos region, he wants that familiar support.
Ash can use old fanfiction to better understand different perspectives within the Pokémon world. Fanfictions might have explored the lives of Pokémon in ways not shown in the main series. By using these ideas, Ash can become more empathetic towards Pokémon and form stronger bonds with them. For example, if a fanfiction delved into the feelings of a shy Pokémon, Ash could use that knowledge to help such Pokémon in his journey.
Well, Ash might use Charizard to battle against strong opponents in Unova. Charizard's powerful fire - type moves like Flamethrower could be very effective. For example, when facing off against some of the tough gym leaders in Unova, Ash could send out Charizard to gain an upper hand in the battle.
To inspire new ideas for his Pokémon adventures.
Well, for one, Haunter has some really cool moves like Hypnosis and Dream Eater. When Ash catches it, his team's battle strategies would change. His other Pokémon would need to learn to work with Haunter. Also, Haunter's presence might intimidate some of the opposing Pokémon, giving Ash an edge in battles. It could also open up new exploration opportunities as Haunter might be able to access areas that other Pokémon on his team can't due to its Ghost - type nature.
One idea could be that Ash and Misty visit Unova for a Pokemon tournament. They meet new friends and face new challenges together. Misty could use her water - type Pokemon in creative ways against the Unova Pokemon's unique types.
It can create a lot of drama. The relationship between Hinata and Naruto was something that many fans were rooting for, so when Hinata rejects Naruto, it can shock the readers and lead to a lot of emotional turmoil in the story. This can keep the readers engaged as they wonder how Naruto will react and if there's any chance for them to get back together.
On the other hand, it could also add some complications. Ash might face more jealousy or higher expectations from others. But overall, it would likely add a deeper layer of meaning to his journey. He could be on a quest not just to be a Pokémon master, but also to make his father proud. And he might be more eager to explore the mysteries of his family's connection to Pokémon, which could lead him to new and exciting adventures.
Romances can add emotional drama. For instance, if two trainers in love end up on opposite sides of a Pokémon battle tournament, their relationship will be put to the test, creating a more engaging story.