One great aspect of 'Pokemon Ash in Kalos Fanfiction' is the new adventures it presents. Ash's journey in the Kalos region in fanfiction often has unique twists. For example, the fanfic writers might introduce new Pokemon that Ash befriends in ways different from the original series. It also allows for different character developments, like Ash becoming more strategic in battles.
One popular storyline is Ash's adventures in the Kalos region while building relationships with different female characters in his 'harem'. For example, his interactions with Serena might include them training Pokémon together and having deep conversations that strengthen their bond. Another could be Ash forming a team with multiple female trainers from Kalos, and they all support each other in Pokémon battles and in exploring the region. There are also storylines where Ash has to protect his friends in the harem from various threats in the Kalos region, like Team Flare.
Serena is a very common character. She has a pre - existing relationship with Ash from the anime and is often a central part of the harem in these fanfictions. Another one is Miette. She is competitive and her interactions with Ash can add an interesting dynamic to the story. Bonnie is also sometimes included. Her innocent and curious nature can bring a different flavor to the harem, especially with her love for Pokémon and her dreams of becoming a Pokémon trainer like Ash.
There's also a fanfiction called 'Ash in Kalos: A New Beginning'. This one focuses on Ash arriving in Kalos and how he adapts to the new region. It has some great character development for Ash, as well as for his Pokemon. The story is well - written and has some interesting takes on the Kalos gym battles.
I would recommend 'Ash's Kalos Adventure Redefined'. It has a great plot where Ash discovers a hidden power within one of his Pokemon. It's really engaging.
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 possible story could be that Ash and Dawn meet in Kalos and decide to team up for a Pokemon tournament. They bring their unique skills and Pokemon from their respective regions and face many challenges along the way, like dealing with tough opponents and adapting to the new Kalos Pokemon.
Serena could be one of the main characters in the harem. She has a close relationship with Ash already in the original series. Also, Miette might be included as she showed interest in Ash. And Shauna could also be part of it as she was always friendly towards Ash during his Kalos journey.
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.
Well, it's popular because Ash is a beloved character. Fans are always interested in seeing more of his story, especially in a new region like Kalos. The fanfictions often explore his relationships with new friends and Pokemon in Kalos. They can also delve deeper into his growth as a trainer, which is something that the official series might not fully explore. For example, some fanfictions might show Ash's struggle with new battle strategies in Kalos in more detail than the anime. And the Kalos region itself offers a lot of inspiration with its fashion, culture, and unique Pokemon species.