Their relationship would become deeper and more complex. With a baby in the picture, they would have to share their lives in a more intimate way. Cynthia, who might be used to her own independent ways of Pokemon training, would have to adjust to having Ash around all the time for the baby. And Ash would also change. He would become more protective and less reckless in his Pokemon adventures as he has a family to think about now.
They would become more united and responsible. Their relationship would shift from just being friends or fellow trainers to co - parents. They would need to communicate more about the baby's needs, like what kind of Pokemon - related education to give the baby.
Well, initially they might be a bit nervous about their new roles as parents. But as time goes on, they would become more in sync. Their relationship would be filled with more love and care not just for each other but also for their baby. For example, they might argue less about Pokemon battles and more about which Pokemon is the safest for the baby to be around. And they would support each other more in their parenting journey, which would strengthen their bond.
It could be a jealous fellow trainer. There are always those in the Pokémon world who envy the skills and achievements of others. This trainer might see Ash and Cynthia as obstacles to their own glory and decide to betray them to get ahead.
There could be a mysterious dark - type Pokémon that is attracted to the unique energy of the baby. It constantly tries to get close to the baby, which poses a threat to the baby's safety. Ash and Cynthia have to fight this Pokémon off while also trying to figure out why it is so interested in their baby.
One idea could be that their baby has a unique ability to communicate with all types of Pokemon instantly. Since Ash has such a strong bond with Pokemon and Cynthia is a very skilled trainer, their child could inherit extraordinary powers. Maybe the baby grows up with Pikachu as its best friend and Pikachu helps teach it about different Pokemon behaviors.
In the fanfiction, the baby might inherit Ash's adventurous spirit and Cynthia's strategic mind. So when it comes to Pokemon exploration, it would be fearless in going to new places. But when it's time for battles, it would carefully plan out every move. It could also befriend Pokemon in the wild very easily, much like Ash, and have a deep understanding of Pokemon types like Cynthia.
Ash could develop his ability to understand different Pokemon cultures better. Cynthia, being from a different region, has a lot of knowledge about various Pokemon traditions. Ash could learn from her and in turn, teach her about his own experiences. This exchange could make Ash more worldly and Cynthia more in touch with the broader Pokemon community. In terms of their relationship, they could start to rely on each other more, which would be a big step for both of them character - wise.
One possible plot could be that Ash and Cynthia meet during a Pokemon journey. They start as friends, gradually fall in love, and then decide to start a family. Their baby could inherit their love for Pokemon and perhaps have some unique abilities related to Pokemon communication or training.
A possible plot could be that a magical event causes Ash and Cynthia to be magically linked to a baby in a mysterious way. They have to travel to different regions to find a way to break the link if they want to continue their normal lives. But during this journey, they start to form a strong bond with the baby and question if they really want to break the link after all.
I'm not sure if there is such a specific fanfiction. Fanfiction can cover a wide variety of scenarios, but this particular one might be a bit unusual or not very common. You could try searching on major fanfiction websites to see if it exists.
You can try fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Ash Cynthia Diantha' on their search bars and you'll likely find a bunch of relevant fanfictions.
One great fanfiction could be 'The Journey of Ash with Cynthia and Diantha'. It has an interesting plot where Ash travels with the two strong trainers, Cynthia and Diantha, and they face various challenges together. They encounter powerful Pokémon and unique terrains. Another good one is 'Ash's Encounter with Cynthia and Diantha's Worlds'. In this, Ash gets to experience the different training styles of Cynthia and Diantha, which is really fascinating as he learns new techniques and strategies from them.