A good team could be Sprigatito, Fuecoco, Pawmi, Tarountula, Nacli, and Smoliv. Sprigatito has cute and useful moves early on. Fuecoco is a solid Fire - type. Pawmi is an Electric - type with some nice attacking moves. Tarountula can be great for its Bug - type attacks. Nacli is a sturdy Rock - type, and Smoliv has potential as a Grass - type.
In Pokemon Scarlet fanfic, a recurring theme is the power of Pokemon. How they can change the course of a battle or a journey. Also, the theme of loyalty. Pokemon are often shown as being extremely loyal to their trainers. And the theme of mystery, as the Scarlet region has many secrets waiting to be uncovered in these fanfics.
One possible team for the Pokemon Scarlet story could be this. Start with Fuecoco, it's a reliable Fire - type. Then get Pawmi, its Electric - type abilities can be very useful. Tarountula is a good Bug - type to have in your team. Nacli, a Rock - type, offers great defense. And Smoliv, which can evolve into a strong Grass - type. This combination gives you a variety of types to deal with different opponents during the story. For example, Fire against Grass, Electric against Water, Bug against Psychic, Rock for defense, and Grass for other situations.
In fanfiction, Pikachu's Mega Evolution often brings out new and exciting abilities. Writers might imagine Pikachu growing larger, with enhanced electric powers. It could have the ability to create more powerful thunderbolts or even manipulate electricity in new ways, like forming shields or sending out electric waves to paralyze opponents from a greater distance.
In a fanfic about Meowth evolving, it could be that a powerful enemy forces Meowth to adapt and evolve in order to protect its friends. This evolution might give it new abilities and a different appearance, perhaps more intimidating to foes.
One idea in fanfiction could be that Ash discovers a special item that enables his Charizard to mega evolve again, but into an even more powerful form. This new mega form might have different coloration and enhanced fire - based abilities. It could breathe a type of blue - flame that is hotter and more destructive, making it a force to be reckoned with in battles.
It could be a scientist who is involved in the study of Pokemon genetics. While trying to understand the mechanics of evolution better, they accidentally stumble upon the new evolution and then become involved in the events that unfold as a result, both in the scientific and the trainer communities.
It could also revolve around a genetic experiment gone wrong that accidentally creates a new form of evolution for some Pokemon. These newly evolved Pokemon are initially feared but eventually prove to be helpful in a crisis situation, teaching the humans and other Pokemon the importance of acceptance and adaptability.