One popular Ash and Dawn Sinnoh fanfiction could be those that focus on their journey through the Sinnoh region, with new adventures not shown in the original series. For example, a fanfiction might have them encounter a rare and powerful Pokemon that changes the course of their journey.
There are fanfictions where Ash and Dawn develop a deeper friendship or even a romantic relationship during their Sinnoh adventures. These often explore their characters in more depth, showing how they support each other through tough battles and difficult decisions. Some might also include elements of other characters from the Sinnoh region interacting with them in unique ways.
Some Pokemon - focused forums also have sections dedicated to fanfictions. Members of these forums often share and discuss their own works or recommend good ones they've read. It might take a bit more digging, but you could find some hidden gems there.
An engaging plot is key. It could involve new Pokémon battles, unique storylines that tie in with the Sinnoh region. Maybe they discover a hidden power in a Pokémon that changes the course of their journey. Also, the relationship between Ash and Dawn should be developed in an interesting way, like a slow - burn friendship or something more.
One popular fanfiction could be 'Dawn's Unspoken Feelings'. It might explore Dawn's deep admiration for Ash in a really sweet way. Another could be 'A New Dawn for Ash and Dawn' which perhaps shows their relationship evolving during their Pokemon adventures. There's also the possibility of 'Dawn's Love Across Regions' where Dawn's love for Ash endures even as they travel to different areas in the Pokemon world.
One reason is the chemistry that can be created between them in fanfictions. In the original series, they have a certain dynamic that can be easily turned into a romantic one. Also, fans are always curious about 'what if' scenarios. What if Ash and Dawn fell in love? A kissing scene is a big part of that exploration. It adds a new dimension to their relationship that the anime might not have fully explored.
I'm not really sure which specific 'Ash and Dawn high school lemon fanfictions' are popular. Fanfiction is a very diverse area, and popularity can vary greatly among different platforms and fan communities. You could try searching on major fanfiction websites like FanFiction.net or Archive of Our Own, but be aware that 'lemon' fanfictions often contain inappropriate content, so it's best to focus on more family - friendly versions of Ash and Dawn stories.
There are fanfictions where Ash and Dawn participate in Unova's Pokémon contests. Dawn, with her contest experience, could teach Ash some new tricks. They could enter as a duo and create unique performances using Unova's Pokémon. In some fanfictions, they also meet old friends from other regions in Unova, which leads to a lot of fun interactions and reminiscing about their previous adventures.
I don't really recommend focusing on fanfictions with such a title that might imply inappropriate situations. However, there are many great Ash and Dawn fanfictions that focus on their adventures, like those where they travel together to new regions and face challenges. These fanfictions usually develop their characters in a positive and interesting way.
There's a fanfiction called 'Dawn in Alola: A New Beginning with Ash'. In this one, Dawn arrives in Alola to study different Pokémon training styles. Ash is already there, and they end up sharing their experiences. It shows how they both grow as trainers in the Alola region, with lots of cute Pokémon interactions along the way.
There's also 'Dawn's Hidden Feelings'. In this fanfiction, the author explores the deep emotions between Ash and Dawn that lead to some rather intimate scenes. But keep in mind that these types of fanfictions are often not in line with the original family - friendly nature of the Pokémon series.
Ash may develop his skills further in Sinnoh fanfictions. He could become more strategic in battles, learning from the different types of Pokémon and trainers in Sinnoh. May, on the other hand, might expand her knowledge of Pokémon contests, incorporating Sinnoh - style elements into her performances. Their experiences in Sinnoh help them grow both individually and as friends.