Well, Ash could lose his trust in people. If he's betrayed, he might become more guarded and less likely to form new friendships. This could change his entire approach to his Pokémon journey. He might start to rely more on his Pokémon for emotional support rather than other humans.
In the fanfic, Ash's Pokémon might also sense his betrayal and become more protective of him. They could evolve in new and unexpected ways due to their strong emotions. For instance, Pikachu might gain a new powerful electric move out of its determination to protect Ash from those who betrayed him.
The story could also lead to Ash having to face his betrayers in a big showdown. He might have to use his wits and the bond with his Pokémon to overcome them. This could be a very emotional and action - packed part of the fanfic, with Ash having to decide whether to forgive his betrayers or seek revenge.
One idea could be that Ash is betrayed by his so - called friends in the Pokémon world. They might be jealous of his status as the Chosen One and team up against him. For example, Gary could spread false rumors about Ash, causing other trainers to doubt him.
Perhaps Ash has been deceived by a false prophecy or a mysterious figure. This false information could lead him to believe that capturing Arceus is the only way to save the Pokémon world from an impending doom. So, in his misguided attempt, he betrays Arceus.
His rival could be the one to betray him. Rivals are often jealous and competitive. If Ash's rival saw an opportunity to gain an advantage by betraying him, they might do it. For instance, they could lie about Ash to the Pokémon League, getting him disqualified from important battles.
One example could be a story where Ash is betrayed by his so - called friends in the Pokémon world who are jealous of his status as the chosen one. They might spread false rumors about him, causing him to lose the trust of the people around him.
Perhaps in the fanfiction, Ash was betrayed by a powerful mentor figure. This mentor, who was supposed to guide him, saw Ash as a threat to their own power or plans. So they leaked Ash's secrets to his enemies, which led to his downfall. It could also involve a love interest. Say, a girl Ash trusted and liked turned out to be working for the villains all along and used his feelings for her to betray him.
The development could involve a complex plot. First, establish Ash's journey as the chosen one. He has a mission, and he's making progress. But then, an unexpected entity betrays him. This could be a spirit or a powerful trainer. They use Ash's trust against him. For example, they lead him into a dangerous situation under the pretense of helping him. As a result, Ash loses his confidence and has to start from scratch to regain his status and trust. The story can then focus on his redemption and how he overcomes the betrayal.
Well, it might be that his rivals in the fanfiction somehow manage to deceive his Pokemon into thinking Ash is a bad trainer. Maybe they spread false rumors about how he doesn't really care for them, which causes the Pokemon to betray him. This would shatter Ash's world as his Pokemon are his closest friends and partners.
Latias could initially go into hiding, feeling hurt and betrayed. She might avoid Ash at all costs. Then, Ash could realize his mistake and start searching for her to apologize.
Another possibility is that there is some kind of dark influence at work. A powerful and malevolent force could be manipulating people's minds to turn them against Ash. This force might see Ash as a threat and use this underhanded method to get rid of him, causing his world to crumble as he is betrayed by all.
In this kind of 'ash and riolu betrayed fanfic', it might be that Ash and Riolu are in a Pokémon tournament. They meet a new trainer who seems friendly and offers to team up with them. However, during the tournament, this so - called friend betrays them by using underhanded tactics. This could include things like secretly weakening Riolu before a battle or spreading false rumors about Ash to other trainers. As a result, Ash and Riolu not only lose the tournament but also feel deeply hurt and betrayed.