Maybe a familiar face from the past shows up and brings back those memories. Or a certain place or event triggers the recall of the painful past.
Painful secrets can make the characters more relatable. Just like in real life, when Pokemon have secrets they're hiding, readers can empathize with them. It adds an emotional layer to the story.
Some fanfics might explore the painful secret of a Pokemon's origin. For example, a Pokemon that was created through an unethical experiment. It has to live with the knowledge that it was not born in a natural way, which can be a very heavy burden for it. This kind of secret can add a lot of depth to the story.
In this fanfiction, it may center around Ash's return with a new goal. For example, he could be aiming to uncover a mystery that has been hidden in the Pokemon world for ages. He might meet new allies along the way, and together they could explore uncharted areas or try to solve problems that are threatening the balance of the Pokemon world. There could be a lot of character development for Ash as he faces these new situations, and we might see him grow not only as a trainer but also as a person.
I'm not sure specifically as it depends on the particular fanfic. But it could be a well - known Pokemon trainer like Ash, who discovers some painful secrets about the Pokemon world. Or it might be an original character created by the fanfic writer.
One great 'Return to the Past Naruto Fanfiction' is 'Naruto: Back to the Beginning'. It has an interesting plot where Naruto goes back in time and uses his future knowledge to change things. He's able to prevent some of the tragedies that happened in the original story.
Perhaps the 'painful secrets' involve the relationships between trainers and Pokemon. It could be that a trainer has a hidden agenda that is causing distress to their Pokemon, like using them for some not - so - noble experiments. This would add a dark and mysterious layer to the fanfic.
Ash is likely to be one of the main characters, as the title implies his return. His Pokemon like Pikachu would probably also play important roles.
In many Pokemon fanfictions about Ash's Charizard's return, it often brings a sense of excitement and nostalgia. Usually, Charizard comes back stronger than ever, ready to help Ash in his new battles. It might have learned new moves during its time away, which makes it an even more formidable partner for Ash.
Some fanfictions might also include new characters that Ash meets on his return journey. These could be trainers with unique Pokemon or mysterious characters who have a connection to the events that led to Ash's return. For example, a young trainer who idolizes Ash and wants to learn from him, or a character who has information about a powerful Pokemon that Ash is interested in.
In 'pokemon the chosen ones return fanfiction', it might be about how the return of these chosen Pokémon disrupts the existing order in the Pokémon world. For example, their return could create a power imbalance that other trainers or Pokémon have to adjust to. It could also be a story about redemption if the chosen ones had left under some sort of cloud before. Their return could be a chance for them to make things right and be heroes once again. The fanfiction might also introduce new Pokémon species that are related to the story of the chosen ones' return.