Perhaps there could be a plot where evil humans form a secret organization. Their goal is to brainwash Pokemon to fight against other Pokemon and trainers. This would lead to a lot of chaos and destruction in the Pokemon world, and the story could focus on how the heroes uncover this plot and save the day.
One common type is the power - hungry villain. They see Pokemon as a means to gain ultimate power and control. They don't care about the well - being of the Pokemon or the balance of the Pokemon world.
Another possible plotline could be that Evil Ash is on a quest to conquer a certain region. Serena, with her own Pokemon, decides to oppose him. Along the way, they both discover new things about the Pokemon world and themselves. Serena might have to team up with other trainers to stand a chance against Ash's newfound power.
Well, you could focus on the relationships. Maybe a Charmander - turned - human has a deep friendship with a Squirtle - human. They could be going on adventures together, facing challenges like normal humans but also having some unique Pokemon - related problems. For instance, they might be hunted by an evil organization that wants to use their Pokemon powers for bad things.
One interesting plot could be that Pokemon gain the ability to communicate complex ideas with humans and start to influence human society in ways like promoting environmental conservation. They might use their unique powers to clean polluted areas, and humans have to adapt to this new Pokemon - led environmental movement.
One interesting concept could be how the legendary Pokemon's unique powers translate into human abilities. For example, a Mewtwo as a human might have extraordinary psychic powers that manifest in ways like telekinesis and mind - reading. Another concept could be their relationships with other humans and Pokemon. They might struggle to fit in or be revered because of their 'legendary' status.
A really exciting plotline could be Ash getting a chance to time - travel. He could go back to the past and meet his younger self or even go to the future to see how far he has come as a trainer. Along the way, he would face challenges related to the different time periods and the Pokemon that exist there.
Another plotline could involve the characters from Pokemon getting involved in the political and social structures of the DxD world. This might include Pokemon trainers having to navigate the complex hierarchies and power plays in the DxD universe, which could lead to all sorts of adventures and conflicts.
Well, in some 'evil pokemon fanfic' you might find a story where a group of rogue trainers form an alliance with dark - type Pokemon. They use their Pokemon's powers to disrupt Pokemon battles and tournaments for their own gain. There could also be a tale of a Pokemon researcher who goes bad and tries to use his knowledge to create super - powerful but evil - minded Pokemon. Some fanfics might even show a Pokemon evolving in an unexpected and evil way because of exposure to a strange energy source.
One idea could be exploring how the Pokemon's unique abilities are used to control humans. For example, a psychic - type Pokemon might use its mind - control powers. Another could be the power struggle between different Pokemon species over the enslaved humans.
One idea could be a world where humans and Pokemon have to compete in a series of challenges to share resources. Another could be a Pokemon rebellion against humans who have been mistreating them.