In a 'ash and pikachu snivy betrayed' fanfiction, the betrayal could stem from a misunderstanding. Maybe Snivy overhears Ash making a plan that it misinterprets as something harmful to the Pokémon world. As a result, Snivy feels it has no choice but to betray Ash and Pikachu to protect what it believes in. It could then side with a group of anti - human Pokémon who are also misinformed about Ash's intentions.
It could be a powerful and jealous Pokémon trainer. This trainer might want to get rid of Ash so he can be the best. He manages to brainwash Snivy into betraying Ash and Pikachu. This trainer would be the main antagonist, constantly trying to stop Ash from achieving his goals and causing trouble for him through Snivy's betrayal.
Ash would be extremely devastated. Pikachu is not just his Pokémon but also his closest friend. He would likely first try to reason with Pikachu, not believing that Pikachu could truly betray him. He might be in denial for a while.
Perhaps Pikachu discovers a 'dark truth' about Ash. For example, Pikachu might find out that Ash has unknowingly been involved in something that goes against Pokémon ethics, like being associated with a group that mistreats Pokémon. This discovery could make Pikachu feel betrayed by Ash first, and then Pikachu's actions would make Ash feel the same way in return.
One common theme is friendship. Since they are two different Pokémon, their journey to becoming friends is often explored. For example, they might start off not understanding each other but then learn to appreciate each other's strengths.
There could be a fanfiction where Pikachu and Snivy participate in a Pokémon tournament together. They train hard and develop new strategies. Snivy might learn some new moves by observing Pikachu's fighting style, and Pikachu could gain better control over his electric attacks with Snivy's advice. Their bond grows stronger as they progress through the tournament, facing tough opponents and making new friends along the way.
The contrast between their types makes it interesting. Pikachu is an Electric - type and Snivy is a Grass - type. Their interactions can lead to unique storylines, like how they deal with different terrains. Electric - type Pokémon are often associated with speed and energy, while Grass - types are more about calmness and growth. When combined in a story, it can create a great dynamic.
It should start with a strong foundation of friendship. They need to have mutual respect for each other. For example, Ash should respect Snivy's decisions during battles and Snivy should respect Ash's leadership. Then, small moments of kindness and care can be added, like Ash sharing his food with Snivy or Snivy protecting Ash from minor threats.
There could be a story where Pikachu and Snivy are in a Pokemon center and an unexpected event leads to a special bond between them. It might involve them helping each other in a unique way that deepens their connection.
Well, there are many great writers. Some fans who have a deep understanding of Pokémon behavior like to write these fanfictions. One popular writer might be someone who goes by the name 'PokeFan123'. They often create stories where Snivy and Pikachu have really unique personalities and adventures.