Some plotlines involve the baby being in some kind of danger related to the Pokemon world. Maybe a powerful and evil Pokemon organization targets the baby because they see potential in the baby's abilities. Then Ash and May have to go on a dangerous journey to protect their baby. Also, there could be a plotline where the baby discovers a rare and mysterious Pokemon that no one has ever seen before. This could lead to a whole new adventure for the family as they try to understand this new Pokemon and keep it safe from those who might want to use it for bad reasons.
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.
In such a fanfiction, it could show Ash and May growing up and realizing their feelings for each other over time. They might start a family and raise their baby in a world filled with Pokemon adventures. Their baby could potentially inherit their love for Pokemon and start its own journey one day.
In these fanfictions, Ash's character as a father might show his determination to protect the baby at all costs. His experience in facing various challenges in the Pokemon world would make him a fearless protector. May, on the other hand, could bring her nurturing side to the parenting role. She might be more focused on the baby's daily needs like feeding and clothing. Ash would be more about teaching the baby about Pokemon battles and adventures.
Maybe in the fanfiction, they go on a special journey together. During this journey, they face a unique Pokémon that has the power to bring out hidden emotions. This makes them realize their love for one another. As a result, May gets pregnant. Ash is super excited and a bit nervous at the same time. They then start preparing for the baby, like building a nursery in a peaceful Pokémon - filled area where they plan to raise their child.
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.
In some fanfictions, Ash might develop a special bond with both Serena and May. For example, they could be exploring a new region together and encounter a rare Pokemon. Serena could use her knowledge of Pokemon behavior to track it, May could come up with a battle plan, and Ash would be the one to catch it. This kind of adventure would strengthen their friendship and show how well they work together.
There are many ways fanfiction writers can take this concept. They could write about the baby having special powers or a unique connection to Pokemon. It could also be a story about the family traveling together, with Ash and Serena passing on their knowledge and values to their child. This type of fanfiction can be a great exploration of family dynamics within the Pokemon universe.
In this fanfiction, Ash would have to be really patient. Baby Pokemon need a lot of care. He might start with teaching them basic things like how to find food in the wild. For example, he could show a baby Pikachu where to find the juiciest berries. And he'd have to protect them from other wild Pokemon that might see them as easy prey.
It could be a rival trainer. Rival trainers are often very competitive in the Pokémon world. Maybe this rival is jealous of Ash and May's progress and decides to betray them to slow them down. They might spread false rumors about Ash and May, causing other trainers to be distrustful of them.