Gary can be really interesting too. His relationship with Ash is always a bit complex. When he gets scared by Ash and Pikachu while with his Electrivire, his pride might be hurt, and seeing how he bounces back from that, whether by getting revenge or just brushing it off, would be engaging.
Ash is always interesting. He's the main character with his strong bond to Pikachu. His reactions to scaring Gary and how he deals with any consequences would be fun to see.
It could be that Ash and Pikachu are trying to play a prank on Gary. Pikachu jumps out and scares Gary who is with his Electrivire. Then Gary might get angry at first but then they end up having a friendly battle or competition after the initial scare.
In a fanfic, Ash might tell Gary a spooky story about an Electrivire that went berserk. With Pikachu by his side for added effect, Ash could describe in vivid detail how the Electrivire was uncontrollable and its power was overwhelming. Gary, being a competitive trainer, would be both scared and intrigued, wondering if he could ever handle such a Pokémon. This could play on Gary's insecurities as a trainer and create a great story of fear and rivalry.
The plot could be as simple as Ash training an Electrivire in secret. When Gary challenges Ash to a battle, Ash unleashes the Electrivire, which is much more powerful than Gary expected. Pikachu could also be involved by taunting Gary's Pokémon during the battle, adding to the overall scare factor.
I'm not sure if there is a specific 'ash no pikachu fanfic' out there. There are countless fanfics in the Pokémon fandom, but this particular one might be hard to find. You could try searching on dedicated fanfic websites like FanFiction.net or Archive of Our Own and use the relevant keywords to see if it exists.
The main characters are obviously Ash and Gary. Ash is the determined and kind - hearted Pokémon trainer we all know, and Gary is his rival - turned - traveling companion in this fanfic.
One possible plot could be that Ash turns into Pikachu and has to learn how to communicate with his human friends in this new form. He might struggle at first, but then discovers that he can use his Pikachu abilities in unique ways to help the group in battles and in solving problems around them.
Brock could be a great addition. He could provide some comic relief and also be the voice of reason. For example, when Ash and Pikachu get into some crazy situations, Brock could be the one to offer practical solutions.
A Gary and Ash yaoi fanfic can be quite an interesting exploration of their relationship in a different light. It often delves into the complex emotions and unspoken feelings between the two characters. Some fanfics in this genre might focus on their adventures together, but with a romantic and homoerotic undertone. However, not all of them are well - written. It's important to look for those that manage to capture the essence of the characters while also presenting a believable romantic storyline.
One idea could be that the female Pikachu has a special power that only Ash can help her control. For example, she might be able to communicate with a certain type of Pokémon that is usually very difficult to reach. Ash, with his experience and kind heart, guides her in using this power for good, like helping to resolve a conflict between different Pokémon groups in a forest.
One possible plot could be that Ash starts his journey with a different starter Pokémon, like Bulbasaur. Without Pikachu by his side, he might face different challenges and form different relationships. He could struggle more in the early battles without Pikachu's electric power, but then develop unique strategies with his new Pokémon team.