Her partner would be a very likely character to be involved. They could be the source of support, or in some cases, the source of conflict if they have different views on the pregnancy. Her best friends are also likely to be in the fanfic. They might be there to throw baby showers, give advice, or just be a shoulder to cry on.
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.
A common plot in Serena pregnant fanfic could be Serena's pregnancy being unexpected. She then has to rearrange her life plans. She might have to put her career on hold or find a new way to balance it with motherhood. There could also be a story where Serena is part of a community of pregnant women and they all share their experiences, which helps Serena grow and prepare for motherhood.
One possible plot could be Serena discovers she's pregnant during her Pokemon journey. This could bring about a lot of changes in her goals and how she interacts with her Pokemon. Maybe she has to take a break from her usual adventures to take care of herself and the upcoming baby, and her Pokemon become more protective of her.
Overcoming obstacles. There could be various obstacles like financial concerns (in the context of the Pokémon world), or dealing with enemies who might see the baby as a threat. The fanfic may show how Ash and Serena work together to overcome these challenges and ensure a safe and happy future for their family.
In fanfiction, anything can happen. However, without specific details of the particular fanfic, it's hard to say for sure if Serena is pregnant. Some fanfictions might explore this plotline for the sake of drama or character development. It could add an interesting twist to the relationship between Ash, Serena and Lemon, but it also depends on the overall theme and direction the author wants to take the story.
Often, the fanfic will focus on Serena's emotional state during pregnancy. She might be worried about how this will change her life. Will she still be able to pursue her dreams in the Pokemon world? There could be internal conflicts within her, like whether she should focus on being a mother or continue her journey as a Pokemon trainer. This adds depth to her character in the fanfic.
One possible antagonist could be Blair. If she still has feelings for Nate, she might see Serena's pregnancy as a threat to her relationship with Nate, whether it's a real relationship or just her own feelings. So she could try to create problems between Nate and Serena during the pregnancy.
One possible plot could be that Serena discovers she's pregnant and is initially scared. Nate, on the other hand, steps up and they decide to face this new chapter together. They start preparing for the baby, from choosing a nursery to attending parenting classes. Along the way, they face some judgment from their friends and family, but their love for each other and the unborn child helps them overcome all the obstacles.
Blair would probably be initially shocked and a bit judgmental. But deep down, she'd be there for Serena. She might try to control the situation at first, like making sure the news doesn't spread too far too fast. Nate would be supportive in a more laid - back way, while Chuck might offer some practical advice, although he'd also be a bit cynical about the whole situation.