Perhaps a dark - haired trainer who has a grudge against Ash and sees Caroline as a way to get back at him. This trainer uses underhanded tactics like poisoning Pokémon or sabotaging their training areas. Ash and Caroline must figure out his motives and stop him before he causes more chaos in the Pokémon world.
A powerful and greedy Pokémon collector could be the main villain. He wants to capture all the rarest Pokémon for his own collection, regardless of the harm it does to the Pokémon and their habitats. Ash and Caroline would have to stop him from achieving his evil goals.
A new villain could be a powerful and dark psychic - type Pokemon. This Pokemon could have the ability to turn Ash into a Pokemon as part of its grand plan to take over the Pokemon world. It sees Ash, who has always been a symbol of hope and a strong trainer, as a threat even in his human form. So, by turning him into a Pokemon, it hopes to disrupt the balance and order that Ash has been a part of maintaining.
A new evil organization could be created for the fanfiction. They could be a group of scientists who want to use Pokemon for their own cruel experiments. Angie and Ash find out about their plans and have to stop them before they harm too many Pokemon. They might be led by a mysterious figure who has a personal vendetta against Ash for some reason.
It could be Team Rocket. They might have some sort of hold over Clemont, forcing him to betray Ash. Team Rocket has always been after Ash's Pikachu, and using Clemont to get to Ash would be a devious plan for them.
Team Rocket would be a likely main villain. They are a big part of the Pokemon Red and Blue story, and when Ash enters this world, they would surely cause trouble for him. Their schemes to steal Pokemon and take over the world would be a direct threat to Ash and his new friends.
One idea could be that Ash and Caroline meet during a Pokémon tournament in a far - off region. Caroline has a unique Pokémon that Ash has never seen before, and they start to bond over their shared love for Pokémon. They then team up to explore a mysterious dungeon filled with rare Pokémon.
It could be a powerful and evil Pokemon trainer who wants to capture Ash in his new Pokemon form. This trainer might be after Ash because he believes that a human - turned - Pokemon has some special power or value.
Maybe a powerful and evil pokemon trainer who has a vendetta against Ash. Now that Ash is in a vulnerable pokemon form, this trainer could try to capture and control him. The trainer might have some dark motives related to using Ash's unique situation to gain power in the pokemon world.
The main characters are Lillie and Ash. Lillie is a character known for her unique relationship with Pokemon, especially considering her backstory. Ash, on the other hand, is a well - known Pokemon trainer with a lot of experience.
Maybe Team Rocket could have a new member who is a ninja. This new member could be Ash's main rival. They would try to steal Ash's pokemon in more sneaky and ninja - like ways. And Ash would have to use his ninja skills to protect his pokemon and defeat this new rival from Team Rocket.
A new villain, a mad scientist type, who is obsessed with the power of the Mega Buster. He wants to reverse - engineer it to create an army of robotic Pokémon with similar weapons.