One popular 'Ash Dies' Diancie fanfiction might be 'The Last Adventure of Ash and Diancie'. In this story, Ash's sacrifice could be tied to protecting Diancie's special powers from an evil force. Another could be 'Ash's Farewell in the Diancie Realm' where his death has a profound impact on the Diancie and the entire Pokémon world it inhabits. There could also be a fanfiction where Ash's death is a selfless act to save Diancie from a natural disaster in the Pokémon universe.
When 'Ash Dies' in a Diancie fanfiction, it often serves as a major turning point. If Ash was an important figure in the relationship with Diancie, his death might cause Diancie to question its own purpose or power. Maybe Diancie was relying on Ash's strength and now has to learn to be strong on its own. This internal struggle can be a big part of the plot. Also, other Pokémon might react differently to Ash's death. Some might be angry and seek revenge, while others might become more protective of Diancie, all of which can greatly influence the plot.
There might be a fanfiction where Diancie is lost in a strange world and Ash is the one who finds it. He then takes on the task of guiding Diancie back to its own realm while facing various challenges along the way. This could involve battles with other Pokémon and tricky terrains.
A powerful and greedy Team Rocket member could be the main antagonist. They might be after Diancie because of its rare and valuable powers. They could try to capture Diancie and use it for their own evil purposes, like selling its powers or using it to take over the Pokemon world.
One idea could be Ash and Diancie teaming up to save a forest full of Pokemon that are being threatened by a powerful and evil force. Another could be Diancie getting lost in a human city and Ash helping it find its way back home while also protecting it from those who might want to capture it.
First, think about the relationship between Ash and Diancie. Do you want them to be friends, or is there a more mentor - like relationship? Then, come up with a plot. It could be an adventure where they explore a new region together.
In certain fanfictions, Ash might die from an incurable disease that he contracts while exploring a new and mysterious region in the Pokémon world. His Pokémon then have to deal with his loss and some might go on a journey to find a way to bring him back. For example, Pikachu could be determined to find a mythical Pokémon that has the power to revive the dead.
In fanfiction, if Ash were to die in Pokemon XYZ, it would be a huge shock to the Pokemon world. His friends like Pikachu would be devastated. Maybe Team Rocket would even feel a strange sense of loss. It could lead to a whole new storyline where his friends try to avenge his death or carry on his legacy of becoming a Pokemon Master.
There could be. Fanfiction is a very creative and diverse medium. Writers can take the Pokemon XY setting and create all kinds of scenarios, including ones where Ash meets an untimely end. But it might not be a common type of fanfiction because Ash is such an iconic and beloved character. His death would be a very drastic departure from the normal upbeat and adventure - filled Pokemon stories.