The story could develop in many ways. For one, Ash might enter new tournaments with Gengar by his side. Gengar's presence could attract the attention of other trainers who are either scared or intrigued. This could lead to some unique battles where Ash has to prove that he can handle Gengar well. Also, Gengar might have some secrets or a past that gets revealed as it spends more time with Ash. Maybe it was once part of an evil team but now has a chance to be good with Ash as its trainer.
In the fanfic, once Gengar is captured by Ash, the story development could be really exciting. Ash and Gengar would start to form a bond. This bond could be tested in different situations. For instance, when they are in a forest full of wild Pokémon, Gengar could use its powers to protect Ash and the other Pokémon. As they travel together, Gengar might introduce Ash to a whole new world of ghost - type Pokémon and their habitats. Ash could then decide to focus more on understanding and training ghost - type Pokémon, which would change the direction of his entire Pokémon - training journey.
In some fanfictions, when Gengar gets captured by Ash, it might lead to some really interesting team dynamics. Ash could use Gengar's unique abilities in battles. For example, Gengar's ability to phase through walls could be used in creative ways during gym battles or against Team Rocket. Maybe Gengar would initially be a bit rebellious, but over time, it would grow to respect Ash as its trainer. Ash would also have to find new ways to train Gengar compared to his other Pokémon, since Gengar has different strengths and weaknesses.
There's a possibility that it's a villainous trainer. This trainer might capture Gengar with the intention of using it for evil purposes, like using Gengar's powers to steal other Pokémon or cause chaos in Pokémon battles.
Well, perhaps Gengar is captured by a powerful trainer. The trainer might use a special Poké Ball to catch it. Then, Gengar could try to escape from the ball by using its ghostly powers.
In this kind of fanfiction, it would be a really interesting twist. Ash usually starts with Pikachu, but having Gengar as a starter would change a lot of the story dynamics. Gengar is a Ghost/Poison type, which is much different from Pikachu's Electric type. This could lead to different battle strategies and interactions with other trainers. For example, Gengar's ability to phase through walls and its spooky nature could add a whole new element to Ash's journey. Maybe he would face more challenges against trainers who are used to dealing with the typical starter Pokémon types like Fire, Water, and Grass.
Well, the story could develop in many ways. Ash might go into a deep depression at first. He has been with Pikachu for so long that its absence would be a huge blow. He could start doubting his abilities as a Pokémon trainer.
In this fanfiction plot, Gengar could be the key to unlocking a hidden world of Pokémon. Since it's a Ghost - type, it might have a connection to a dimension that other Pokémon and trainers don't know about. Ash, with Gengar by his side, could explore this new world, meet new and strange Pokémon, and learn new battle techniques. Along the way, they would face challenges from other trainers who are jealous of Ash's discovery. The story could build up to a big battle where Ash and Gengar use their new - found knowledge and skills to defeat a powerful enemy and become heroes in the Pokémon world.
Often, his friends will try to find him. Misty and Brock, or his newer friends like Serena, might set out on a journey to track him down. Their search could lead them to new places and new Pokémon they wouldn't have otherwise encountered.
Well, he might start exploring other aspects of the Pokémon world, like studying Pokémon behavior or focusing on Pokémon care.
After Ash gives up on Charizard, the story may shift towards the development of the Pokémon that were previously overshadowed by Charizard. The fanfiction might show how these Pokémon grow and become stronger in Charizard's absence. At the same time, the fate of Charizard itself could be a major plot point. It could be on its own journey, facing new challenges, and potentially evolving further without Ash. This could set up a future reunion between them that is full of drama and excitement.
The story might develop with Suzaku trying to escape from the Black Knights. He could use his combat skills and knowledge of the enemy to plan his getaway.