One possible storyline could be that Ash loses a really important Pokémon battle, like in a championship. He has put so much effort and hope into it, and the loss makes him break down and cry. Maybe he feels like he has let down his Pokémon friends as well.
In a fanfiction, Ash could be betrayed by a friend he trusted deeply. This friend might steal one of his Pokémon or share his battle strategies with an enemy. When Ash realizes this, it shatters his world and he cries. He's not only sad about the betrayal but also worried about the implications for his Pokémon journey.
A possible storyline could be that Ash has a gay friend who is struggling with coming out to his family. Ash, being the kind - hearted person he is, encourages his friend and helps him find the courage to be true to himself. Along the way, they also have Pokémon battles and adventures together.
Another idea is that the discovery of Giovanni as his father makes Ash question his own identity and place in the Pokémon world. He might have to reevaluate his goals and his relationships with other characters. Meanwhile, Giovanni could be faced with the challenge of trying to make amends or trying to bring Ash into his world in a more positive way.
A possible theme is the betrayal by a mentor figure. Suppose an older, more experienced trainer that Ash looked up to gives bad advice on purpose, leading to his defeat. This would make Ash feel both betrayed and sad, crying over the loss of trust and the failure in his Pokémon journey.
One popular storyline could be Ash and a character from the XY series going on an adventure together and slowly realizing their feelings for each other. Maybe they start off as friends, training Pokémon side by side, and as they face challenges, their bond deepens into something more romantic. For example, during a tough Pokémon battle, they rely on each other's skills and that moment of trust makes them see each other in a new light.
One popular storyline is Ash finally achieving his long - dreamed - of victory in the Pokemon League with his Pikachu by his side, facing off against powerful opponents he has met throughout his journey. Another is Ash traveling to a new, mysterious region filled with undiscovered Pokemon species and having adventures there. Also, there are fanfictions where Ash forms an even deeper bond with his other Pokemon, like Charizard, and they go on special quests together.
One interesting storyline could be Ash and Nurse Joy teaming up to rescue a group of Pokémon that have been captured by an evil organization. They use their combined skills and knowledge, with Ash's battle prowess and Nurse Joy's medical expertise to save the day.
In a fanfiction scenario, Tails might cry when he discovers that his past actions have had negative consequences on the Sonic X world. He's always been so eager to help, but if he realizes he accidentally caused harm, it could break his heart. Another situation could be that there's a natural disaster in the world they live in, and Tails is unable to save some of the small animals he loves so much, leading to his tears. And there could be a time when Tails is excluded from a group activity by mistake, and his feelings of being left out make him cry.
One possible storyline could be Ash's journey after becoming the Alola champion. He might travel to other regions to share his Alola - inspired battle strategies. Another could be him mentoring new trainers in Alola, passing on his knowledge and experiences. And perhaps he could face challenges from trainers who want to take his champion title.
Another storyline could involve a female Lugia being in trouble because some evil Pokémon trainers are trying to capture it for its power. Ash hears about this and teams up with his friends to protect the Lugia. Along the way, they face many challenges and Ash has to use his battle skills and knowledge of Pokémon to outwit the villains.
Perhaps Manaphy gets lost, and Ash and May have to search through different regions to find it. During their search, they encounter new Pokemon species and make new friends who help them in their quest. This journey could also strengthen the bond between Ash, May and Manaphy.