In some fanfictions, there could be a magical or mystical element related to Serena's pregnancy. Maybe a rare Pokémon has a special connection to the unborn child, or there are ancient Pokémon legends that seem to be coming true because of this pregnancy. This would add an element of fantasy and adventure to the story, making it more than just a simple pregnancy tale in the Pokémon universe.
One common storyline could be about their journey together as they prepare for the baby. It might include Ash being overly protective and Serena having to deal with her changing body and new emotions. Another could be a story set in a different Pokémon region where they face unique challenges as expectant parents, like dealing with new Pokémon species that are helpful or harmful during pregnancy.
In some fanfictions, the plot could center around Ash and Serena's reactions to the pregnancy. Ash might be over the moon with excitement, while Serena could be a bit more nervous about becoming a mother. They could also have different ideas about how to raise the child. For example, Ash might want the child to be a Pokémon trainer from a young age, while Serena could be more focused on giving the child a normal childhood first. Also, the pregnancy could bring out a more protective side in Ash towards Serena, making their relationship even stronger.
One popular storyline could be Ash and Serena starting at a new Pokemon school together. They might face challenges like dealing with a strict teacher who doesn't believe in Ash's unorthodox training methods. Another could be a school competition where they team up against rivals. It could also involve Serena trying to start a Pokemon - related club at school and Ash being her biggest supporter.
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 storyline could be that Ash and Serena have been traveling together for a long time and their relationship deepens. They might face some initial shock and then start to plan for their future together. They could have to deal with reactions from their friends and family, like Pikachu being both excited and a bit confused.
One popular storyline could be their wedding day itself. It might describe in detail how Ash, who is usually more focused on Pokémon battles, is nervous yet excited as he waits for Serena at the altar. Another could be their life after marriage, like traveling together to new regions with their Pokémon, sharing new adventures and growing closer as a couple. There could also be a storyline where they face challenges together, such as dealing with a new powerful villain who threatens their family and friends, and how they use their combined skills and the strength of their relationship to overcome it.
In some fanfictions, the pregnancy could be a result of a one - time mistake or a rekindling of an old flame. Serena and Nate then have to navigate their feelings for each other, which they may have buried for a long time. They might question whether they are really in love or if it's just the situation that's bringing them together. And as the pregnancy progresses, they start to see new sides of each other that they didn't expect.
I'm not sure about specific popular ones as this is a rather unusual and not very family - friendly concept in the context of the Pokémon series. Fanfictions often vary greatly in quality and content, and this particular theme might not be widely promoted in mainstream fanfiction communities.
Perhaps the story could involve a mystery related to Serena's pregnancy. There could be some strange events or prophecies in the Pokémon world that seem to be connected to the baby. Ash and Serena then have to go on a journey to figure out what it all means. Along the way, they meet new Pokémon and characters who either help or hinder their search for the truth.
Some fanfics focus on the relationship between Serena and Ash. They might write about how Serena finally confesses her true feelings to Ash in a really emotional and romantic way. There could also be a storyline where they get separated and have to find their way back to each other, facing many challenges along the way which test their bond.
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.