There are fanfictions where Ash Greninja plays a key role in protecting Alola from an outside threat. Since it has a strong bond with Ash, it might use that connection to call for help when needed. It could also be part of a story where it tries to teach the local Pokemon some of its own battle techniques, creating a unique blend of battle styles in Alola.
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.
In some fanfictions, Ash Greninja could form an unexpected alliance with a native Alola Pokemon. For example, teaming up with a Rowlet to take on a powerful opponent. It could also be involved in a story where it has to adapt to the more laid - back and fun - loving nature of Alola battles compared to what it was used to before. Often, these stories show how Ash Greninja's skills and experiences from other regions are both an advantage and a source of confusion in Alola.
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