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.
You can try some popular fanfiction websites such as FanFiction.net or Archive of Our Own. Just use the search bar and type in 'pokemon ash and serena hurt' to see what comes up.
One possible 'pokemon ash and serena hurt fanfiction' could be about Ash getting injured during a battle and Serena trying her best to take care of him. Maybe he's poisoned by a wild pokemon's attack and Serena has to find the antidote in a hurry.
A great fanfiction in this regard might involve Serena getting jealous when Ash is constantly talking about a famous Pokemon coordinator. She starts to doubt her own skills and her place in Ash's life. As the story unfolds, she realizes that her jealousy is unfounded and that Ash values her in a unique way. This type of fanfic often plays on Serena's insecurities and her deep feelings for Ash.
Well, it depends on the type of hurt. If it's a minor injury like a scratch from a wild Pokémon, Bonnie might be more worried about the Pokémon that hurt her rather than her own pain. She's that kind of character who is curious about Pokémon. But if it's a more serious injury, it could lead to a big adventure where they have to find a special cure or a rare Pokémon that can heal her.
One possible plot could be that Serena gets hurt during a Pokemon battle. Maybe she's facing a really tough opponent and her Pokemon is unable to fully protect her from an attack. For example, if she's up against a powerful fire - type Pokemon and its Flamethrower grazes her as she tries to dodge. Another could be she gets injured while exploring an unknown area, like a forest filled with wild Pokemon. She might trip over a root and sprain her ankle while running from a territorial Pokemon.
Jealousy can also make Serena more introspective. She might question her own worth and what she brings to her relationship with Ash. This self - examination can lead to her becoming more confident in herself and her abilities. In a fanfic, we could see her start to focus on her own goals more independently while still maintaining her feelings for Ash. She realizes that her jealousy was a sign that she cared deeply, but she also learns that she needs to have her own identity and not rely solely on Ash's attention.
A fanfiction might depict Ash getting hurt when he gets involved in a fight with a powerful trainer. The trainer could have a very aggressive Pokemon that doesn't follow the normal battle rules. This Pokemon might attack Ash directly instead of focusing on his Pokemon. Ash could be bitten or hit hard, causing him pain and injury. He might also be hurt when trying to rescue a trapped or endangered Pokemon in a collapsing building or a flooded area.
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.