In a fanfiction where Ash gets Gastly as a starter, how would his relationship with his other Pokémon be affected?

If Gastly was Ash's starter, his relationship with his other Pokémon might be more diverse. His non - Ghost - type Pokémon would have to get used to Gastly's spooky nature. For example, Bulbasaur might be a bit cautious at first. But over time, they would all learn to work together. Ash would also have to be more creative in his battle strategies, which could bring him closer to all his Pokémon as they adapt to new ways of fighting.

Their relationship grows through battles. Every time they face a tough opponent together, their trust in each other deepens. For example, when they battle a Rock - type Pokémon that is strong against Charmander's fire attacks, Ash comes up with a creative strategy that involves using Charmander's speed. This makes Charmander realize that Ash will always find a way to make them victorious.

His relationship with Pikachu might become a bit more complex. Pikachu could feel a bit jealous at first because Ash is spending a lot of time getting to know and train Meltan and Poipole. But as time goes on, they all learn to work together. Ash's other Pokémon like Bulbasaur and Charmander might also be a bit curious about the new members. They would start to interact more with Meltan and Poipole during training sessions, which could strengthen the overall bond within the team.

At first, his Pokémon would be startled. They've always known Ash as a human. But then, they would start to adapt. Some Pokémon, like Squirtle, might try to play with Ash in his new form, thinking it's a new kind of game. However, his more loyal Pokémon, like Greninja, would be determined to find a way to turn Ash back. Greninja might use its special bond with Ash to try and communicate with him on a deeper level in this new form, to understand what happened and how to reverse it.

His Pikachu might feel a bit jealous at first. But eventually, they would all accept Mew as part of the team. Ash would have to spend more time getting to know Mew's unique abilities, which might mean less training time for the others temporarily. However, in the long run, Mew could teach the other Pokemon some new tricks.

At first, his Pokémon would be shocked. They've known Ash as a human trainer, and now he's this powerful psychic Pokémon. The more aggressive Pokémon in his team might see him as a threat to their position in the group. But the loyal ones, like Bulbasaur, would try to understand what happened. Ash, in his new Mewtwo form, would have to use his psychic abilities to communicate in different ways. He might be able to understand his Pokémon's thoughts more deeply, which could either strengthen or strain their relationships depending on how they all adjust.

One possible plot could be that Ash, instead of starting with Pikachu, starts with a Gastly. Gastly could use its spooky abilities to help Ash in battles. For example, it could use its ability to turn invisible to surprise opponents. It might also play pranks on Ash's rivals, like making them think they're seeing ghosts in the forest where they're camping.

Pikachu would be very worried. It would stay by Ash's side constantly, using its electric shocks to keep him warm if he has a fever. His other Pokémon like Bulbasaur might use its vines to bring water or herbs to help soothe Ash's symptoms. Charmander could use its fire to keep the area around Ash cozy.

Ash's relationship with his Pokémon might become more complex. He could start to question if his Pokémon would still be loyal to him if they knew about his connection to Giovanni. Some of his Pokémon might be wary at first, but over time, they would probably stay by his side because of their bond with Ash.

Some of his Pokémon might be confused. Pokémon like Pikachu, who has a very close bond with Ash, would initially be in shock. Pikachu would likely try to understand why Ash is doing what he's doing and might even try to stop him at first.