How would the Pokemon world react in an 'Ash gets Serena pregnant' fanfic?

Ash would be very worried. He would immediately rush to Serena's side. He might stop whatever he was doing, like a Pokemon battle or exploring, and focus all his attention on her. He would probably ask if she's okay and check for any serious injuries.

The Pokémon community around them would probably be quite shocked at first. Their friends like Brock might be both surprised and happy for them. However, some of the more traditional Pokémon trainers might frown upon it as they are quite young. But Ash's close friends would most likely support them and help them out, like providing a place for May to rest during her pregnancy.

The professors in the Pokémon world, like Professor Oak, would likely be concerned but also offer their wisdom. They could provide resources or knowledge about how to take care of a pregnant woman in the Pokémon world. The other trainers that Ash and Bonnie know might have a mix of reactions. Some might be supportive, while others might spread rumors or be jealous. Overall, the reactions would add a lot of drama and depth to the fanfiction.

Serena could be a bit shy at first. She might blush deeply and look down for a moment. But then, she would look into Ash's eyes with love and admiration. She would tell Ash how much she loves him and how she has been hoping for this moment. She would accept his proposal gracefully, and they would share a tender embrace while their Pokémon friends cheer around them.

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.

Brock would be more understanding. He's always been interested in girls, but he also values friendship. So he would probably offer his support to Ash, while also maybe giving some advice on how to act more 'ladylike' if that's what the situation calls for. As for the other Pokemon in Ash's team, they might not fully understand the concept of crossdressing, but they would sense that Ash is still their trainer and would protect him (or her in this case) as usual.

Pikachu, Ash's main Pokémon, would be very confused. It's used to Ash's mannerisms and commands. When Serena is in Ash's body, Pikachu might not respond as well at first. It might keep looking at 'Ash' quizzically, wondering why he's acting so strange. Serena's Pokémon, like Braixen, might also be confused. They might sense that something is off with 'Serena' (Ash in her body) and be a bit hesitant to follow commands as usual.

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.

No, it's not appropriate. Pokémon is a franchise aimed at a wide range of audiences including children. This kind of fanfiction involves adult and inappropriate themes that are completely out of sync with the family - friendly and positive image of the Pokémon world. It can also be seen as disrespectful to the original intention of the characters and the story.

Pikachu would probably be very excited. It might jump around Ash, making little electric sparks of joy. Bulbasaur could bring Serena some fresh berries it finds in the forest as a sign of care. Eevee, if they have one, might curl up next to Serena's belly, as if protecting the unborn baby. Their Pokémon would sense the importance of this new development and do their best to be helpful and protective.