The time when Ash and May go to Kalos together in fanfiction is completely up to the creator's choice. It could be at any point in the story to serve the intended storyline and character development. Sometimes, it might be a sudden decision that leads to new challenges and discoveries, and other times, it could be a well-planned event that ties into the overall theme of the fanfiction.
In this fanfiction, Ash and May could be on separate adventures in Kalos at first. But then, they cross paths when they both get involved in a mystery related to a rare and powerful Pokémon in Kalos. They have to put their heads together, along with their Pokémon, to solve the mystery and protect the Pokémon from those who would use it for bad purposes.
One great 'ash and may kalos fanfiction' is 'A Kalos Adventure'. It beautifully depicts Ash and May's journey in the Kalos region, with vivid descriptions of the Pokemon they encounter and the challenges they face together.
Friendship is another key theme. Their relationship is developed further in these fanfictions. They support each other during battles, share their experiences, and sometimes even have disagreements that they later resolve, which shows the depth of their friendship. In many of these stories, their friendship is what helps them overcome difficulties in Kalos.
In Kalos fanfiction, Ash might get more serious when he realizes the importance of a particular competition or when he encounters a powerful opponent that forces him to focus and give his all.
Maybe they get involved in a Pokémon beauty contest in Kalos. May, being interested in contests, would be excited to participate. Ash could support her and also learn about the different aspects of Pokémon contests in Kalos. Along the way, they meet new friends and face off against some tough competitors.
They might live in a cozy cottage near a Pokémon forest. Ash could go out every day to train and catch new Pokémon while Serena takes care of their home. She could also start a small garden with Pokémon - friendly plants. At night, they'd share stories about their day over a warm meal cooked by Serena.
One possibility is that they could explore the beautiful Kalos region together. They might visit all the different gyms that Ash didn't get to fully experience before. Serena could also introduce Ash to more of the local cuisine and they could have picnics in the scenic areas of Kalos. Maybe they'd even participate in some local festivals and make new friends together.
The timing of Ash and Gary's travel together in fanfiction varies greatly. It could be at the beginning of their adventure, during a special mission, or even after facing certain challenges. Each fanfiction author has their own creative take on it.
One idea for a fanfiction could be that Ash travels to Kalos with his Infernape. There, Infernape discovers new moves or abilities inspired by the Kalos environment. It could be something related to the fairy - type energy prevalent in Kalos, which gives Infernape an edge in battles against certain opponents.
Their relationship would likely become stronger. They would rely on each other during their Alolan adventures.