One great Pokemon Sun x Lillie fanfic is 'A Journey with Lillie' on FanFiction.net. It really delves into the relationship between the protagonist in Pokemon Sun and Lillie. The story has a great plot that follows their adventures together, and the author does an amazing job of portraying Lillie's character as we know her from the game.
Obviously, Lillie is one of the most popular characters. Her kind heart and her growth throughout the story are often appealing. The main character, who could be a trainer starting their journey in Alola, is also popular as they interact with Lillie and other pokemon.
One interesting plot could be Lillie's journey to become a stronger trainer. She might face challenges and overcome her fears with the help of her pokemon. Another could be a love story between the main character and Lillie, as they travel through the Alola region together.
Often, in 'sun x lillie fanfic', there's the theme of self - discovery. As they interact, they might learn more about themselves. Also, the theme of overcoming challenges together is popular. They face difficulties in their world and work together to overcome them, which makes for an engaging story. There could also be a theme of mystery, where they solve some sort of mystery in their fictional universe.
Some of the best ones are those that blend humor and adventure. Picture a story where Lillie and the protagonist get into all sorts of comical situations while exploring the Pokemon Sun region. Maybe they accidentally swap Pokemon or get lost in a Pokemon - made maze. These stories not only make you laugh but also show the deepening friendship or relationship between them as they figure out how to get out of these sticky situations.
You can start by looking on FanFiction.net. It has a large collection of Pokemon fanfics, including many for Pokemon Sun x Lillie. Another good place is Archive of Our Own (AO3). It also has a variety of fan - created stories in this category.
Realistically, their relationship might start with a simple friendship. Sun helps Lillie become more confident around Pokemon, especially if she was initially a bit scared. As time passes, they start to rely on each other not just in Pokemon - related matters, but also in personal situations. For instance, when Lillie has a problem with her family, Sun is there to support her, and vice versa. Small gestures like sharing food or taking care of each other when sick can also contribute to a deeper relationship.
One interesting plot idea could be that Sun and Lillie go on a journey to discover a new type of Pokemon that has been rumored to exist in a hidden part of Alola. Another could be that they have to team up to save Lillie's mother from some sort of dark force. Maybe they also find a time - traveling Pokemon that takes them back to the past of Alola, and they learn about the origin of some of the local traditions.
Ash is adventurous and bold, while Lillie is more reserved and cautious. Their personalities complement each other. Ash's boldness can encourage Lillie to step out of her comfort zone. For example, when it comes to approaching new Pokemon. And Lillie's caution can sometimes rein in Ash's over - eagerness, preventing him from making hasty decisions in dangerous situations.
Well, without more context about what exactly you're looking for in a 'sun x lillie fanfic', it's a bit difficult to give a definite answer. However, you could also check out fanfic communities on Reddit. There are often discussions and recommendations for different fanfics, including ones about this pairing.