Well, it depends on what you consider 'good'. There are many fanfics out there. Some focus on the romance that led to their marriage, like how Serena finally confessed her love to Ash in a really dramatic way. Others might show how they handle challenges in their married life, like dealing with a rare and powerful Pokemon that threatens their peaceful existence in the Pokemon world.
One popular 'Ash and Serena married' fanfiction is 'A New Beginning'. It shows their life after getting married, with Ash still having adventures and Serena supporting him while also taking care of their home. Another is 'Serena's Dream Come True' which focuses on Serena's perspective of their married life, how she feels about being Ash's wife and the new challenges they face together.
There could be. The Pokemon fandom is quite large and diverse. Fanfic writers love to create unique storylines for their favorite characters. Ash and Serena are popular characters, so it's not surprising that someone might write a fanfic about them having a family. But these types of fanfics may not be endorsed by the official Pokemon creators.
One great fanfic could be 'The Journey of Ash and Serena' which focuses on their adventures together. It has a lot of sweet moments between them and shows how they grow both as trainers and as friends.
There are indeed. These fanfictions usually focus on the deepening of their relationship. For example, one story could be about Ash finally realizing his true feelings for Serena after all their adventures. Then, they get married in a beautiful ceremony attended by all their friends and Pokemon. It shows their love growing and evolving, which is very heartwarming.
We can expect a lot of romantic elements. Maybe they'll go on a honeymoon-like journey across different regions in the Pokemon world, discovering new Pokemon species together.
A possible fanfiction plot could be that Ash, Serena, and May are invited to a mysterious island full of unknown Pokemon. They have to work together to survive and discover the secrets of the island. Ash's leadership, Serena's ability to communicate with Pokemon, and May's quick decision - making skills would be crucial.
One reason could be that she might be worried about Ash getting into dangerous battles. She cares deeply for him and the thought of him getting hurt scares her.
Definitely their close friends like Brock and Misty. They would be there to support Ash. And all of Serena's friends from Kalos too. Also, the Gym Leaders they've met along their journey might be invited. And of course, their Pokemon. Pikachu would be right there by Ash's side, and Serena's Fennekin would also be present.
Well, it could start with Ash finally realizing his true feelings for Serena. Maybe they meet up again after a long time apart. Then they start to plan a small, intimate wedding in a beautiful Pokemon - filled location like a meadow full of Pikachu and Eevee. Their Pokemon friends could help with the preparations, like Pidgey delivering invitations.