Perhaps a plot where Ash and Lillie enter a special Pokemon tournament together. But this tournament has some strange rules that they have to figure out as they go. Along the way, they start to realize their feelings for each other are deeper than just friendship. This causes some tension and also some really sweet moments as they support each other through the tournament.
One interesting plot idea could be Ash and Lillie going on a special mission together to find a rare and powerful Pokemon that has the ability to heal other Pokemon. They face many challenges along the way, like rough terrains and other trainers who also want to capture this Pokemon. Another could be a story where Lillie gets lost in an unknown part of the Alola region and Ash has to use all his skills and knowledge to find her. During this time, he discovers more about Lillie's past and the secrets she has been hiding.
A fanfiction could start with Lillie having a strange dream about a legendary Pokemon. Ash believes her dream could be a sign. So they set out on a quest to find this legendary Pokemon. Along the journey, they meet different characters from the Alola region who give them clues. Their bond deepens as they face difficulties together and eventually find the legendary Pokemon, which turns out to have a special connection to Lillie.
One possible fanfiction could be about Ash and Lillie's adventure in the Alola region. Maybe they team up to face a powerful new Pokemon that has been causing trouble. They use their combined skills and the unique bond they've developed throughout their journey in Pokemon Sun and Moon.
One interesting plot idea could be a story where Gladion and Lillie have to team up to rescue a rare and endangered Pokemon. They might face various challenges along the way, like dealing with Team Skull. Another idea is a time - travel plot where they go back in time to learn more about their family's past and how it relates to the Pokemon world. Or perhaps a story where they are separated in a different dimension and have to find their way back to each other while making new Pokemon friends and allies.
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.
Maybe in the fanfiction, Lillie gets transported to an alternate dimension where the rules of Pokemon battles are different. She has to quickly adapt and learn these new rules with the help of her Pokemon. It could involve her meeting different versions of her friends from Pokemon Moon in this strange new world.
One idea could be a story where Lillie discovers a hidden power within herself during an adventure with the protagonist in Pokemon Sun. Maybe she can communicate with a rare and powerful Pokemon that no one else can. This could lead to a series of events where they have to protect this Pokemon from an evil organization.
One idea could be Ash and Lillie getting lost in an uncharted part of the Pokemon world together. They have to rely on their Pokemon and each other to survive. Another could be a situation where they are accidentally swapped into each other's bodies for a day, leading to all sorts of comical and heartwarming moments as they learn more about each other. A third plot idea might be that they discover a new type of Pokemon that is in danger, and they team up to protect it from an evil organization.
Well, in this fanfiction, Lillie's return often brings new adventures. Maybe she comes back with new Pokemon skills or knowledge. It could also lead to reunions with old friends in the Pokemon Sun and Moon universe.
Ash and Lillie's relationship might develop as they help each other with their personal goals. Lillie could be trying to overcome her fear of Pokemon, and Ash, with his vast experience, could guide her. In return, Lillie could help Ash understand more about the unique culture and Pokemon in Alola. As they do this, they'll start to respect and care for each other more deeply, leading to a stronger bond.
A fanfiction could be about Lillie's attempts to create a new form of Pokemon battle. She might be inspired by the unique environment of Alola and come up with a battle style that combines elements of the local culture. This could attract the attention of other trainers and even lead to a new Pokemon tournament being created in Alola.