One possible fanfiction could be about Ash's adventures in Hoenn during the month of May. Maybe he discovers a new Pokémon species that is only active during this time of the year. He could be traveling with his usual companions and facing challenges specific to the Hoenn region.
A popular one could be 'Ash and May's Hoenn Legacy as They Grow Older'. It might delve into how their past experiences in Hoenn shape their current actions. Maybe they meet old friends and rivals, and the fanfiction could explore the emotions and memories that resurface as they navigate the Hoenn region once again.
DeviantArt can also be a source. While it's mainly an art - sharing platform, there are often stories written in the descriptions of art pieces related to Pokémon. You might stumble upon some 'Ash May Older Hoenn' fanfictions among those. Also, don't forget to check out Tumblr, as there are many Pokémon fans on there who might have created or shared relevant fanfictions.
In this Hoenn fanfiction, Ash and May could be on a quest to find a special item that is said to have great power. They face various obstacles and meet different characters along the way. Their different personalities - Ash being more impulsive and May being more level - headed - would play a big role in how they overcome these challenges.
One possible fanfic could be about Ash and May's adventure in Hoenn where they discover a hidden legend. They might encounter rare Pokémon and face challenges together, strengthening their bond as friends and perhaps hinting at a deeper relationship.
A common theme is friendship. Ash and May's relationship as friends is often explored deeply. They support each other during their Hoenn adventures. Another theme is growth. Both characters usually experience personal growth in these fanfictions, whether it's in their Pokémon training skills or in their understanding of themselves.
I'm not sure specifically as I haven't read that particular fanfic. But generally, it might be about the adventures of Ash and May in the Hoenn region. It could include their Pokémon battles, their growth as trainers, and perhaps some unique storylines that the author has created for them, like facing new and powerful Pokémon or getting involved in some kind of mystery in Hoenn.
One great 'ash and may hoenn fanfiction' is 'A Hoenn Adventure'. It has an interesting plot where Ash and May explore the Hoenn region together, facing various challenges and growing closer as friends. Another one is 'May's Dream in Hoenn' which focuses more on May's personal growth in the Hoenn region while being accompanied by Ash.
You could try looking on fanfic websites such as FanFiction.net or Archive of Our Own. These platforms have a large collection of fan - made stories, so there's a good chance you'll find the 'ash and may legend of hoenn fanfic' there.
I'm not entirely sure specifically what this 'serious ash in hoenn fanfiction' is about without reading it. But generally, it could be about Ash having some serious adventures or facing difficult challenges in the Hoenn region in a fan - created story.