Well, another good place could be some Pokémon - focused forums. There are often threads dedicated to sharing and discussing fanfictions. Members might recommend some great ones that feature Ash, Charizard, Sceptile, and Greninja. You can also check out Reddit's Pokémon subreddit, as there are usually posts about interesting fan - made stories.
One popular trope is the power - up or evolution arc. For example, Greninja might go through a new form of evolution in the fanfiction. Another is the friendship and teamwork between Ash and his Pokémon, like how Charizard, Sceptile, and Greninja work together to overcome a tough opponent.
Charizard X would likely win. It has a huge power boost in its X form. Its fire attacks can be extremely devastating. Mega Sceptile, while fast and having some good moves, just doesn't have the raw power that Charizard X has. In a fanfiction, Charizard X could swoop down from the sky and unleash a powerful Flamethrower that Mega Sceptile would struggle to dodge. And with its enhanced physical abilities, it could also engage in close - combat if needed.
Well, a really interesting plot point is the evolution of their relationship during the fanfiction. Maybe they start off as enemies but then realize they have more in common than they thought. Another plot point could be the discovery of a new power or ability during the battle. For example, Charizard X might develop a new type of fire attack or Mega Sceptile could find a way to make its grass - type moves even more powerful. And the role of other Pokémon in the fanfiction can also be a great plot point. Are there other Pokémon cheering them on? Or are there some trying to interfere in the battle?
One possible scenario in a Sceptile in love fanfiction could be that Sceptile falls for a fellow Pokemon. Maybe it's a kind-hearted Bulbasaur that Sceptile meets during its adventures in the forest. Sceptile, usually a tough and independent Pokemon, is drawn to Bulbasaur's gentle nature. It starts to show its affection by bringing fresh berries for Bulbasaur every day and standing guard over it while it sleeps.
Some fanfictions explore the idea of the two Pokemon learning from each other. After the battle, whether it's a win, lose or draw, they might exchange some sort of knowledge or experience. Maybe Greninja learns how to be more aggressive from Charizard X, or Charizard X learns about agility from Greninja. There are also plotlines where the battle is a test of friendship or loyalty between the Pokemon and their trainers.
There could be unfinished business between them. They might have a shared goal that they haven't achieved yet. Greninja's return to Ash in the fanfiction could be to finally complete that goal, whether it's winning a particular Pokemon tournament or saving a certain place from destruction.
Sceptile usually plays a significant role in Ash - centric fanfictions. It can be a key asset in battles, using its grass - type moves effectively. Its evolution from Grovyle is also sometimes explored in more detail in these fanfictions.
In this fanfiction, Greninja could meet Misty. She's often associated with Pallet Town and she has her own set of water - type Pokemon. Their meeting could be interesting as Greninja is also a water - type Pokemon. They might exchange stories about their battles and experiences with water - type Pokemon.
Once upon a time, Greninja was in a deep, dark forest. It was on a quest to find a special crystal that was said to enhance its water - based attacks. As it leaped from tree to tree, it sensed a strange presence. Suddenly, a group of wild Pokémon emerged. Greninja readied itself for battle, its eyes gleaming with determination.