In fanfiction, Ash's Ponyta could be portrayed in various ways in relation to a lemon. Maybe the lemon is used as a symbol of something in the story, like a rare item that Ponyta is attracted to or it could be part of a magical setting where the lemon has special powers and Ponyta has an encounter with it. However, without reading a specific fanfiction, it's hard to say exactly how they are related in the context of the story.
In ponyta and twilight fanfiction, a frequently seen theme is the combination of different natures. Ponyta's energetic and somewhat wild nature contrasts with Twilight's more studious and cautious nature. This contrast often leads to interesting situations where they have to learn to work together. Another common theme is the protection of their world. They might team up to face threats to Equestria, which shows their sense of responsibility and heroism. Additionally, the theme of acceptance is there, as they accept each other's differences and become better friends because of it.
I'm not sure specifically about 'ponyta lemon fanfiction'. It might be a bit hard to find as it could be a rather niche or even violate some of the fanfiction site's rules if it contains inappropriate content. You could try searching on some general fanfiction platforms and see if there are any clean and interesting Ponyta - related fanfictions.
Honestly, if we consider 'ponyta lemon fanfiction' in a non - inappropriate way, perhaps the uniqueness could be in how it combines the characteristics of Ponyta with some sort of unique plot. Maybe it could be about Ponyta's special journey that is different from the regular Pokémon storylines.
One idea could be that Ash and Ponyta enter a strange land where lemons are the currency. Ponyta has to perform tricks to earn lemons for Ash to buy supplies. Another idea is that a lemon is a magical object that can transform Ponyta into a different form, and Ash has to find a way to reverse it. Or perhaps there's a lemon - eating competition in a town they visit and Ponyta accidentally eats one and gets a super - speed boost as a result.
One great ponyta and twilight fanfiction is 'Ponyta's Adventure with Twilight'. It has an interesting plot where Ponyta discovers a hidden magic and Twilight helps it understand and control it. Another one could be 'Twilight and Ponyta: A Magical Bond' which focuses on their friendship and how they overcome challenges together.
They might have all kinds of adventures. For example, they could explore the unique Alola regions, discover new Pokémon species that are native to Alola. Charizard might also have some interesting interactions with the local Pokémon, like friendly battles or just sharing the same space. Ash could use Charizard to traverse difficult terrains in Alola, like the volcanic areas.
A Litten might be a good choice for Serena. It has a fiery personality and could bring a new dynamic to her team. With proper training, it could become a powerful Fire - type Pokemon in battles against water - type opponents in Alola.
The climate in Alola might affect Charizard. Since it's a tropical region, it could make Charizard a bit more adaptable to warmer and more humid conditions. Maybe its fire - type moves will become even more powerful because of the abundant sunlight in Alola.