One idea could be a story where a Pokemon discovers a hidden rainbow cloud that has the power to grant special abilities. For example, Pikachu finds it and gains the ability to fly temporarily. Another plot could be about a group of Pokemon living on a rainbow cloud, and they have to protect it from an evil team who wants to use its power for bad. Maybe there could also be a plot where a trainer's Pokemon evolves into a new form because of the magic of the rainbow cloud.
Well, a cool plot might be that there's a legend among Pokemon about a rainbow cloud that only appears once in a century. A young trainer hears this legend and sets out on a journey to find it. Along the way, they meet various Pokemon that are also intrigued by the legend. When they finally reach the rainbow cloud, they find that it's a portal to a whole new world of Pokemon with unique types and abilities. This could lead to all kinds of adventures as the trainer tries to explore this new world and make friends with the new Pokemon.
One idea could be exploring the backstories of the Rainbow Rocket members in more detail. For example, Giovanni's motives and how he assembled the team. Another could be a scenario where the protagonist has to infiltrate the Rainbow Rocket base. Maybe they have to find a way to stop a new, more powerful weapon the team is developing.
One idea could be the main character being reborn as a Pikachu and having to navigate the world with its electric powers while making friends with other pokemon. Another could be being reborn as a Eevee and having the unique ability to evolve into any form at will, which causes both envy and admiration among other pokemon. Maybe the reborn pokemon has memories of being a human and uses that knowledge to outwit trainers and other threats.
Well, in 'naruto rainbow fire fanfiction', a cool plot might be that the rainbow fire is actually a key to a different dimension. Naruto, being the curious and brave ninja he is, accidentally stumbles upon this while on a mission. He then has to figure out how to use the rainbow fire to get back to his own world, all while facing strange creatures and new forms of chakra in this other dimension. Also, the rainbow fire could be related to a prophecy that only Naruto can fulfill, which sets him on a grand adventure.
You could start by thinking about the colors of the rainbow. For example, create a Pokemon that is made entirely of rainbow - colored mist. It could have the ability to change its form depending on the weather related to the rainbow cloud, like becoming more solid in sunny weather and more ethereal in rainy weather. Another way is to combine the idea of a cloud with traditional Pokemon elements. Maybe a Pokemon that looks like a fluffy cloud but has lightning bolts (like from an electric - type Pokemon) running through it because it lives on the rainbow cloud.
One idea could be that Rainbow Dash and Soarin enter a flying competition where the prize is a rare lemon - scented flying charm. Along the way, they face challenges that test their friendship and flying skills.
One plot idea could be a story where a trainer forms an unexpected bond with Reshiram. Maybe the trainer is initially afraid of Reshiram's power but over time they learn to work together and understand each other.
A plot idea could involve a Phantump that is actually a reincarnation of a human who had a strong bond with Pokemon. The Phantump then tries to find its way back to its human family while facing the challenges of being a Pokemon in a world that doesn't understand its true nature. It could be a heart - wrenching and exciting story.
One idea could be a crossover where Pokemon trainers visit the Avatar world. They could learn bending techniques and use their Pokemon in unique ways to help the Avatar in a great battle. For example, a Pikachu could use its electricity to enhance a waterbender's attack.
Maybe a story where a group of Pokemon in the Quest world start to develop their own language and culture. A trainer befriends them and tries to understand and document this new development, all while facing opposition from other trainers who think these Pokemon are strange and should be left alone.
A great plot for Pokemon Adventures fanfiction could be centered around a Pokemon with amnesia. The trainer then tries to help the Pokemon remember its past, which leads them on a journey filled with various challenges and revelations. It could also involve the discovery of a hidden Pokemon society that has its own rules and customs. This would add an element of mystery and exploration to the story. Additionally, a story about a trainer who is able to communicate with Pokemon in a unique way, like through dreams or telepathy, could be really interesting.