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 could have many adventures. For example, they might explore the beautiful and diverse regions of Kalos. Latias could use its psychic powers to help Ash find rare Pokémon or hidden treasures. They could also encounter new Pokémon species that are unique to Kalos and form new friendships with local trainers.
She could have adventures exploring the unique Kalosian landscapes. Maybe she discovers new Pokemon species that are native to Kalos. For example, she might come across a Fletchling in one of the beautiful forests of Kalos and try to befriend it. This could lead to a whole new journey as she learns about the behavior and characteristics of Kalos Pokemon.
Well, in this fanfiction scenario, they could go on adventures related to the Mega Evolution phenomenon in Kalos. Mewtwo, being a powerful Pokémon, might have its own insights on Mega Evolution. Ash and Mewtwo could team up to help other trainers whose Pokémon are having difficulties with Mega Evolution. They could also come across some evil organizations in Kalos that are misusing the power of Mega Evolution, and they fight against them to protect the Pokémon world.
In fanfiction, Ash could have many new Pokemon adventures in Kalos. He might meet new Pokemon species unique to Kalos, like Greninja. He could also face off against new trainers with different battle styles. And perhaps make new friends along the way who help him understand the Kalos region better.
One great aspect of a fanfiction where Ash starts in Kalos is that the environment is so different from what he's used to. The Kalos region has its own set of challenges, like the mega - evolution phenomenon. Ash could get involved with researching about it early on. He might also form new friendships with characters like Serena right from the beginning, and together they could embark on a journey filled with new discoveries and exciting battles.
He could have a Froakie. It's a common and cute starter in Kalos. Maybe also a Skiddo for traveling across the Kalos landscapes. And a Bunnelby would be a nice addition for its digging abilities.
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.
Perhaps they will explore the hidden areas of Kanto. There could be rare Pokémon or mysterious items waiting to be discovered. They might also meet some old friends along the way and reminisce about their past adventures.