If Greninja stuck with Ash, their teamwork could evolve to a whole new level. They might face off against stronger opponents and achieve greater victories together. Also, it could deepen the emotional connection between Ash and Greninja, making for more heartwarming moments.
One main theme is friendship. Ash and Greninja have a deep bond that is often explored. Another theme is growth, as Greninja evolves and becomes stronger with Ash by its side.
Well, 'Ash and Greninja: Unbreakable Bond' is a popular fanfic. It shows how they support each other through tough times in their journey. It has a lot of emotional moments. There's also 'Greninja's Hidden Power in Ash's Team' which explores Greninja's unique abilities and how they contribute to Ash's overall team strategy. This fanfic is really good at highlighting Greninja's role in the team.
The fusion's character can be developed by highlighting the combination of Ash's determination and Greninja's grace. For example, in battles, it could show a tenacious fighting spirit but also a fluid and elegant style of combat.
One idea could be that Ash and Greninja's fusion has to battle an ancient evil that threatens the Pokémon world. The fusion might have unique powers that are a combination of Ash's strategic thinking and Greninja's combat skills.
One great 'pokemon ash x greninja fanfiction' is 'The Bond Beyond Battle'. It focuses on their unique connection and how they face challenges together. Another one is 'Greninja's Ascent' which shows Greninja evolving with Ash's support in a really cool way.
Obviously, the main characters are Yoshi and Greninja. Yoshi is a cute and friendly dinosaur - like creature known for its ability to eat enemies and turn them into eggs. Greninja, on the other hand, is a water - type Pokémon with ninja - like skills, being very fast and agile.
Well, a plot could involve Yoshi getting lost in a strange new world and Greninja being the only one who can guide him back home. Along the way, they face various challenges that test their friendship. For example, they might encounter a powerful storm that Greninja has to use its ninja skills to shelter Yoshi from. And as they journey, they learn more about each other's cultures and become great friends.
Ash would likely be shocked at first. He's so used to seeing the good in people, especially fellow trainers. But then he'd probably get angry and determined to set things right. He has a strong sense of justice, so he wouldn't let the betrayal go unpunished.