First, do your research on Pokemon Platinum and Darkrai. Know their characteristics, abilities, and the lore surrounding them. For Darkrai, it's important to understand its dream - related powers. Then, come up with a unique plot. Don't just copy existing stories. Maybe think about how Darkrai would interact with other Pokemon or trainers in the Platinum world in a new way.
One plot idea could be Darkrai's struggle to fit into the Pokemon world of Pokemon Platinum. Since it's often seen as a menacing and mysterious Pokemon, it could be about it trying to prove that it has good intentions. For example, it might try to protect a small village from other powerful Pokemon threats, all while the villagers are initially afraid of it.
The fanfic might explore the relationship between Darkrai and Alice. It could be about their adventures together in the Pokemon world. Maybe Darkrai, being a mysterious and often misunderstood Pokemon, forms a special bond with Alice, and they face various challenges.
Another theme could be about acceptance. Darkrai is a rather unique and often feared Pokemon. The fanfic could show how Alice comes to accept Darkrai for who it is, including its potentially dangerous abilities. And also how Darkrai accepts Alice as a friend or partner.
It could be about a fan - created story that combines the Pokemon universe with the story elements of 'Rise of Darkrai'. Maybe it features Pokemon characters in situations related to Darkrai's rise, like battles, alliances, or adventures in the world influenced by Darkrai's powers.
Often, the theme of protection is present. Darkrai, being a powerful Pokemon, might protect Dawn from various threats in the Pokemon world. Also, the theme of self - discovery can be seen. Dawn may learn more about herself through her interactions with Darkrai, and vice versa. Some fanfics also explore the theme of mystery, given Darkrai's enigmatic nature.
One possible fanfic could be about a trainer in the Pokemon Sky world who has a special encounter with Giratina, Darkrai, and Gengar. Maybe they all meet in a mysterious forest. The cake could be a magical item that restores their energy or is a key to a hidden place. For example, the trainer uses the cake to lure Gengar out of a spooky cave, and then Giratina and Darkrai show up because they sense the power of the cake.
It could be the main Pokemon trainer from the Pokemon series. And of course, Darkrai would likely be a major character as it's in the title related to its rise. There might also be other popular Pokemon like Pikachu or Charizard depending on the writer's preference.
One idea could be to explore an alternate storyline where the main character fails to stop Team Galactic's initial plan and has to deal with the consequences. Another could be a fanfic centered around a new Pokemon species discovered only in the Platinum region that has unique abilities. Or perhaps a story about a trainer who has the ability to communicate with Pokemon in a more in - depth way than normal trainers and how that affects their journey in the Pokemon Platinum world.
To write a Pokemon Darkrai fanfic, start by getting to know Darkrai's lore. You can look at the official Pokemon games and anime for inspiration. Next, think about the theme of your fanfic. For example, it could be about friendship, like Darkrai befriending a young Pokemon. Develop your characters well, give them distinct personalities. When it comes to the story, build tension and conflict. For instance, Darkrai might have to face a powerful enemy that wants to use its dream powers for evil. And don't forget to proofread your work to make sure it flows well.