One interesting idea could be Naruto developing new and unique jutsu that no one has ever seen before. For example, he might combine different elemental chakra in unexpected ways.
In some fanfictions where Ash's Gible evolves, it might gain new and powerful moves. For example, it could learn Dragon Claw and become a more formidable opponent in battles against other trainers' Pokémon. It might also develop a closer bond with Ash as it evolves, showing more loyalty and determination to win battles for him.
Another possibility is a rival trainer who has a Pokemon that is weak against Raichu. This trainer might try to prevent Pikachu from evolving to keep their own Pokemon's advantage in battles. They could try to steal Pikachu's food or training resources to slow down its growth and evolution.
One possible plot could be that Pikachu is exposed to a rare form of electric energy in a thunderstorm that's charged with some mysterious power. This could start the evolution process. It might struggle at first, not understanding the changes its body is going through. As it evolves, it could gain new abilities like enhanced speed and a more powerful electric attack. And it might have to face new challenges in battles, as opponents are now more cautious of it.
One possibility could be that Meowth evolves after a deep emotional experience. Maybe it befriends a Pokémon that is in great danger and through the process of saving it, Meowth unlocks a new level of power within itself and evolves. This could lead to a whole new form with different abilities and a more noble appearance.
The main characters would be Ash and Gible without a doubt. Ash as the trainer is responsible for Gible's growth and development. Gible, on the other hand, is the focus of the evolution part. However, depending on the fanfiction, other trainers that Ash competes against could also be considered main characters. They might be envious of Ash's Gible evolving or try to come up with strategies to defeat it once it has evolved.
In a fanfiction about Pikachu evolving, it might happen because of a strong emotional bond. Suppose Pikachu is trying to protect Ash from a great danger. In that moment of extreme self - sacrifice and love for Ash, it evolves. This evolution could lead to a whole new dynamic in their relationship. Ash would have to learn how to train a Raichu instead of a Pikachu, and Raichu might be more independent but still deeply loyal to Ash.
According to the original text of the novel," The Creator woke up from Chaos, broke the darkness, and created the first ray of light. He completely integrated into the universe and became all things. His body became the earth and the stars. One of his eyes became the sun and the other became the crimson moon. Part of his blood surged into the sea and rivers, nourishing and nurturing life. His lungs evolved into elves, his heart evolved into giants, his liver evolved into treemen, his head evolved into dragons, and his kidneys evolved into feathered serpents." His hair evolved into an immortal bird; His ears evolved into a demonic wolf; His mouth and teeth became mutants; His remaining bodily fluids evolved into sea monsters, the essence of which was Naga; His stomach, his small intestines and large intestines, and the evil parts of his body evolved into demons, evil spirits, and various unknown evil existences. His essence became the Eternal Blazing Sun, the Lord of Storms, the God of Knowledge and Wisdom; and from his wisdom, humans were born. This was the First Epoch, the Chaos Era."
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One possibility is that Ash has to quickly adjust to Raichu's new power levels. Raichu might be a bit more independent compared to Pikachu, which could lead to some initial clashes in their teamwork. But in the end, they could become an even more formidable team, with Raichu's increased strength allowing them to take on tougher opponents in battles.