I'm not sure specifically as there could be many different 'ash's snivy evolves' fanfics. Generally, it might be about the evolution of Snivy in Ash's team. It could involve the journey leading up to the evolution, like the battles and experiences that trigger it.
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.
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.
You can try looking on fanfic websites like FanFiction.net or Archive of Our Own. They have a large collection of Pokémon fanfics and there's a good chance you'll find 'ash's snivy evolves' fanfic there.
If Pikachu evolves in a fanfiction, it might have an impact on Ash's relationships with other characters. Some trainers might see Ash as a more serious threat now that his Pikachu has evolved. Others might be jealous or try to figure out how he achieved such a transformation.
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.
Well, if Ash's Pikachu evolved into Raichu in fanfiction, it could change the whole dynamic of their journey. Pikachu's evolution might bring new power levels and moves, making battles easier or more complex. Ash would need to adjust to the new Raichu, and their bond might be affected. Maybe Pikachu's cute factor would be replaced with a more intimidating Raichu presence. It could also lead to new storylines where Ash has to deal with the jealousy of other Pokemon or trainers who are envious of his powerful Raichu.
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.
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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In Digimon I, the reason why Awu's Bada-beast was so powerful but rarely evolved was because he was one of the evolved forms of the Bada-beast. He needed to do specific things at a specific time and place to evolve.
Awu's Bada Beast performed well in the battle, but he faced many restrictions throughout the entire process. For example, he had to fight other Digimons in a specific scene to evolve. He had to wait for a certain amount of time before he could see the evolution of the Bada Beast, which also brought him certain restrictions.
In addition, Awu's Badar Beast was a relatively powerful Digimon in the first game. Its evolution required a lot of energy and it needed to overcome some difficulties to evolve. Therefore, Awu had to constantly challenge himself in order to gradually improve his Digimon's ability and obtain a stronger evolution.
In summary, the reason why Awu's BadaBeast was so powerful but rarely evolved was because he was one of the evolved forms of the BadaBeast. He needed to do specific things at a specific time and place to evolve. He needed to constantly challenge himself to gradually improve his Digimon's ability.