Another popular trope is the 'mystical connection'. Some fanfictions explore a special, almost magical connection between Delphox and Greninja. This could be related to their elemental powers or some ancient Pokemon lore. It adds an element of mystery and intrigue to the story, making it more engaging for readers.
A simple fanfiction could be that Greninja and Delphox are forced to be allies when their trainers are kidnapped by an evil organization. They have to put aside their differences and work together to rescue their trainers. Greninja uses its agility to scout the enemy base, while Delphox uses its fire attacks to create distractions.
One great idea for a fanfiction could be a story where Greninja and Delphox team up to face a powerful, mysterious new Pokemon that threatens their region. They have to combine their unique skills, Greninja's speed and water - based attacks with Delphox's fire - magic and psychic abilities.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. They have a large collection of Pokemon fanfictions, including those featuring Delphox and Greninja. Just use the search function and type in the relevant keywords.
The combination of their abilities is also crucial. Greninja's water - type moves and its acrobatic fighting style along with Delphox's fire - based attacks and psychic - like abilities can create interesting battle scenarios and story arcs in the fanfic.
A great 'pokemon greninja x delphox fanfic' could be 'The Elemental Connection'. This fanfic delves deep into the elemental aspects of Greninja's water - based moves and Delphox's fire - based powers. It shows how their opposing elements can create a harmonious balance when they team up against common enemies in the Pokemon universe.
One popular trope is the power - up or evolution arc. For example, Greninja might go through a new form of evolution in the fanfiction. Another is the friendship and teamwork between Ash and his Pokémon, like how Charizard, Sceptile, and Greninja work together to overcome a tough opponent.
One popular story might be about Ash Greninja exploring the unique Alola region, facing new Pokemon and challenges. Maybe it discovers new Z - Moves specific to Alola. Another could be its interactions with the local trainers and Pokemon in Alola, learning about the different cultures and battle styles there.
One common trope is the journey together. Characters in an altoshipping often embark on Pokemon adventures side by side. They might discover new Pokemon species or face difficult battles together. Another is the overcoming of differences. Since in altoshipping, it might involve pairings that are not the typical ones, they have to overcome the initial odd looks or doubts from others in the Pokemon world. Also, the growth of the relationship over time, starting from just acquaintances to deep, unbreakable bonds.
One possible story could be that the baby inherits the speed and agility of Greninja and the magical abilities of Delphox. Maybe it grows up in a world where it has to learn to control both its water - based ninja skills from Greninja and the fire - based magic from Delphox. It could face challenges from other Pokémon who are either jealous or afraid of its unique powers.
As I said before, FanFiction.net and Archive of Our Own are great places to start. They have a large collection of Pokémon - related fanfictions, including those about greninja and delphox's relationship.