One possible adventure could be them getting involved in a local Pokémon festival. They might participate in contests or help organize events. Ash could show off his battle skills in friendly exhibitions, while Lillie could share her knowledge about Pokémon care with the festival - goers.
They could explore ancient ruins. Maybe they find a hidden cave filled with rare Pokémon. Ash's battle skills and Lillie's knowledge of Pokémon lore would come in handy.
Their relationship could develop through shared experiences. As they travel, they rely on each other more. Ash helps Lillie become more confident in dealing with Pokémon battles, and Lillie helps Ash understand the unique aspects of Alola's Pokémon.
Well, in this fanfiction, Ash and May would surely have an exciting journey. May, with her Contest experience, could bring a new perspective to the Alolan Pokémon scene. They could encounter the Totem Pokémon and face the challenges together. Ash could also show May his favorite spots in Alola, like the Pokémon School. They might even get involved in some local Alolan traditions related to Pokémon.
One possible adventure is exploring the Kanto region's famous Pokémon gyms. Ash already has experience with these gyms, and he could guide May through the challenges. They might also encounter some rare Pokémon along the way, which would be exciting for both of them. Maybe they'll find a Pokémon that neither of them has seen before and have to figure out how to catch it together.
They could have Pokémon battles against powerful trainers in different regions. Ash's battle experience combined with Cynthia's strategic skills would make them an unbeatable team.
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.
Well, in many fanfictions of their love, it often shows a very sweet relationship. They might go on adventures together in the Alola region, with Ash protecting Lillie from any harm. The beauty of these fanfictions lies in how they develop their relationship gradually. For example, they could start as friends who slowly realize their deeper feelings for each other.
They might have all kinds of adventures. They could explore the unique Pokémon in Alola. Ash would be excited to discover new Pokémon species and train them. Serena might be interested in the local culture and how it relates to Pokémon. Maybe they'll participate in some Alolan Pokémon contests together, with Serena showing off her skills and Ash cheering her on.
In fanfiction, Ash might help Lillie become more confident in her Pokémon training. Since Ash is an experienced trainer, he could share his knowledge and skills with her.
It could also be due to some external influence. Perhaps an evil organization has manipulated Ash in some way, forcing him to act against Alola. They might have used mind control or blackmailed him with something he holds dear, like the safety of his Pokémon.