Well, Pikachu could evolve due to a new type of energy in Pokemon Masters. This energy might be related to the sync pairs or the special powers in the game. For instance, if Pikachu forms a super - strong sync pair with a trainer, it could gain enough power to evolve.
In a fanfiction, Pikachu's evolution might be part of a prophecy. There could be an old legend in the Pokemon Masters world that talks about a Pikachu evolving into a super - powerful Raichu to save the day. So, as the story unfolds, Pikachu gradually fulfills the conditions of the prophecy and evolves.
One idea for a fanfiction is that Pikachu evolves because of a mistake. Maybe a scientist in Pokemon Masters is experimenting with some new technology or power - up items. By accident, Pikachu is exposed to this and it causes an unexpected evolution. This could then lead to all sorts of interesting plot developments, like Pikachu having to learn how to control its new powers and how the other Pokemon and trainers react to its new form.
Some fanfictions might take a more emotional route for Pikachu's evolution in Pokemon Masters. Suppose Pikachu witnesses the endangerment of its friends or the whole Pokemon community. This sense of responsibility and the need to become stronger could drive it to evolve. It's a common trope in fanfiction to have a character's evolution be linked to their emotional and moral growth.
It could be portrayed as a moment of great transformation. Ash might be hesitant at first, but realizes the potential of a Raichu. The evolution could be triggered by a very powerful opponent that makes Pikachu see the need to evolve. Then, as Raichu, it could start showing off new moves and a more confident attitude, which Ash would have to get used to.
It would be really exciting. In the fanfic, Ash might be a bit hesitant at first because he loves Pikachu as it is. But when Pikachu decides to evolve, it could be a powerful moment. Maybe Pikachu evolves to save Ash from a super - strong enemy. And as a Raichu, it would have new abilities and a different appearance, which could lead to new adventures for Ash and his evolved Pokemon.
Well, he might start to see the world from a Pikachu's perspective. For example, he would experience the small size and how everything looks so huge. He could also find it difficult to communicate with his human friends in the normal way since he is now a Pikachu. Maybe he would have to rely on Pikachu's ways of expressing emotions like using electrical signals.
In some fanfictions, Pikachu could inherit Ash's dream. Ash had a big dream of becoming a Pokemon Master, and Pikachu might take up that mantle in a way. It could start traveling to different regions, challenging strong trainers, all while carrying the memory of Ash with it. This would show how much Ash influenced Pikachu during their time together.
In such a fanfic, Pikachu might use its electric attacks like Thunderbolt. Bayleef could counter with its grass - type moves such as Razor Leaf. Maybe Pikachu's speed gives it an edge in dodging Bayleef's attacks at first. However, Bayleef's sturdy build could help it withstand Pikachu's electric shocks. The battle could be very intense with both Pokemon trying their best to win.
In many fanfictions, Ash's Pikachu evolving can be a really interesting concept. It might change the entire dynamic of their journey. For example, an evolved Pikachu could have different battle strategies and a more powerful electric charge. This could lead to Ash facing stronger opponents and having to adapt his training methods.
One possibility is that Pikachu's discovery of Ash's Pokemon instincts leads to a new training method. Since Pikachu realizes Ash has this special understanding, they could work together to train the other Pokemon more effectively.
It could be about their adventures together. Maybe they team up to explore a new region, facing various challenges and making new friends along the way.
In the fanfiction, a new Pokémon arrives in their area. This Pokémon is a bit of a troublemaker and causes chaos. Pikachu and Buneary have to figure out a way to calm it down and make it a part of their community. They use their different personalities, Pikachu's bravery and Buneary's kindness, to befriend the new Pokémon.