In the fanfiction, Ash could be developed by having him face a moral dilemma through Geovonie's influence. For example, Geovonie might introduce Ash to the idea of not always using Pokémon for battles but also for other peaceful purposes like helping in the community. This could make Ash question his own motives. Geovonie, on the other hand, can be developed by Ash teaching him about the importance of having a strong bond with Pokémon, which he might have overlooked in his more research - based approach.
In the fanfiction, Ash might meet Dawn's brother in a Pokémon center. The brother could be a bit skeptical of Ash at first, thinking he might not be good enough for his sister. However, as they start talking about their Pokémon training experiences, he begins to respect Ash. For example, Ash could share his adventures in different regions and how he overcame various challenges, which impresses Dawn's brother.
Well, there are several common themes. First, there's the theme of acceptance. Ash has to accept Gengar, even though it might be a bit of an odd or scary Pokémon at first. Second, the idea of transformation. Gengar could transform Ash's view of the world of Pokémon, showing him new perspectives. And third, the theme of cooperation. They often end up working together, whether it's to defeat a powerful enemy or to achieve a common goal in the Pokémon universe. This cooperation can be both in battles and in non - battle related situations, like finding a lost Pokémon or exploring an ancient ruin.
One interesting plotline could be Ash's journey of self - discovery as he meets different Pokegirls. Each Pokegirl might have her own unique abilities and personalities, and Ash has to learn to interact with them all. For example, he might meet a shy Pokegirl at first and has to find a way to make her open up.
There could be a Pikachu - like Pokegirl. She might have the same cute appearance as Pikachu but with her own unique Pokegirl traits, like being able to communicate in a more complex way. Another main Pokegirl could be a water - type Pokegirl, maybe with a mermaid - like appearance, who is very good at swimming and has water - based powers.
There are quite a few 'Ash meets a Gengar' fanfictions out there. One type you might come across is where Gengar plays pranks on Ash and his friends, leading to some comical situations. Another could be a more serious take, like Gengar being a key to solving a mystery in the Pokémon world that Ash gets involved in. It really depends on the creativity of the authors.
One great Ash meets Serena fanfiction could be the one where they reunite after a long time apart in a new region. It shows their deepening bond as they face new challenges together.
You can find Ash meets Serena fanfiction on fanfiction.net. It has a large collection of stories related to Pokémon, including many focused on their relationship.