One idea could be that Chesnaught and Greninja are on a quest to save their forest home from a mysterious dark force. They start as rivals, each thinking their own way is best to protect the forest, but as they face challenges together, they learn to work as a team.
The 'alola greninja returns fanfic' might focus on Greninja's journey back to Alola. It could start with Greninja feeling a pull towards Alola, perhaps due to some unfinished business or a connection it still has with the place. Once there, it could encounter various Pokemon and trainers. There might be a story arc about Greninja finding its place again in Alola, dealing with changes that have occurred since it was last there, and forging new relationships while also rekindling old ones.
In the Pokemon Alola Greninja Ultra Adventures fanfic, Greninja may be a sort of guide or protector. It could lead other Pokemon or trainers through dangerous areas in Alola. It might also be involved in teaching new battle techniques to the local Pokemon or trainers. Given its agility and strength, it would be a very important character in the story, perhaps even having a special connection to some ancient Alolan power or legend.
A possible plot could be a tournament. Chesnaught and Greninja both enter a high - stakes Pokémon tournament. They meet in the semi - finals and have an intense battle. But then they realize that there is a conspiracy behind the tournament, and they join forces to expose it.
One great greninja x delphox fanfic is 'The Bond Beyond Types' on FanFiction.net. It delves deep into their unique relationship, exploring how their different natures and abilities complement each other in unexpected ways.
The contrast between greninja's sleek, ninja - like nature and delphox's more elegant and magical aura. Their combination in a fanfic can lead to really cool interactions and storylines.
One popular 'ash and greninja fanfic' might be those where they face an extremely powerful and rare Pokemon together. In these stories, Greninja's unique abilities combined with Ash's leadership and battle strategies create exciting adventures. For example, they could be on a quest to save a region from a mysterious dark force. Greninja's water - type attacks and its transformation capabilities play a crucial role in the battles, while Ash's bond with his Pokemon gives them an edge.
A good fanfic of their reunion should have a strong emotional connection. Show Ash's excitement and Greninja's loyalty. Also, a great plot like a new threat they must face together.
Since it's a fanfic about Greninja returning to Alola, Greninja is surely a main character. Besides, the fanfic might introduce new characters who play important roles. There could be a mysterious trainer who has a connection to Greninja's past in Alola. Also, there may be Pokemon that Greninja teams up with to face challenges in Alola. These could include both common and rare Alola Pokemon, and their interactions with Greninja would be a big part of the story.
There could be unfinished business between them. They might have a shared goal that they haven't achieved yet. Greninja's return to Ash in the fanfiction could be to finally complete that goal, whether it's winning a particular Pokemon tournament or saving a certain place from destruction.