What if the Omnitrix was actually a gift from a legendary Pokemon? In this fanfiction, Ash is chosen to receive it because of his pure heart and strong will. However, using it comes with a price. Every time he transforms, it drains his energy, and he has to find a way to replenish it. This could involve seeking out special items or places in the Pokemon world. His friends would have to help him manage this new challenge.
One great idea for a Pokemon Ash and Omnitrix fanfiction could be Ash finding the Omnitrix in the Pokemon world. Maybe it fell through a dimensional rift. He could use it to transform into different Pokemon - hybrids of Pokemon and the alien forms from the Omnitrix. This would give him a whole new set of powers and strategies to use in his Pokemon battles and his adventures.
One possible fanfiction could be about Ash forming a special bond with Salamence. Maybe Salamence is a wild Pokemon that Ash manages to befriend through his kindness and understanding, which is different from his usual way of catching Pokemon. This could lead to an adventure where they face a powerful enemy together and Salamence's unique abilities help them win.
A third popular plot in Pokemon Ash brainwashed fanfiction is that Ash is brainwashed as part of a scientific experiment gone wrong. The story then focuses on his friends and allies in the scientific community trying to reverse the process while also dealing with the chaos that Ash's new, brainwashed state is causing in the Pokemon world.
One possible storyline could be Ash and Alexa teaming up to discover a new and rare Pokemon species in a previously unexplored region. They could face various challenges like difficult terrains and other trainers trying to steal their discovery.
One interesting plot could be Ash forming a unique bond with each Pokémon in his harem. For example, he might have special training sessions with different Pokémon that are tailored to their individual strengths and weaknesses.
One creative plot could be that Eevee is a reincarnation of a powerful ninja spirit. Naruto senses this and helps Eevee to unlock its hidden powers. This could involve training sequences where Naruto uses his own ninja training methods on Eevee.
A creative plot could involve a mad scientist trying to use Pokémon DNA to create super - humans in a TF (transformation) experiment. The Pokémon could resist this unethical experiment, leading to a battle of wills. Or perhaps a group of Pokémon scientists are working on an experiment to make Pokémon communicate better with humans through a form of TF that gives them more human - like intelligence and speech abilities.
One idea could be a story where the Omnitrix is fused with a Pokeball, allowing the protagonist to transform into a Pokemon and use its powers while also being able to capture other Pokemon in a unique way. Another could be a cross - over where characters from Ben 10 (where the Omnitrix is from) end up in the Pokemon world and have to use the Omnitrix to survive and understand the new environment. A third idea is a story where a Pokemon trainer discovers an ancient Omnitrix - like device that gives them the ability to transform into rare and powerful Pokemon forms that no one has ever seen before.
A possible plot could be that Ash gets lost in a spooky area where Fantina is known to reside. She takes him under her wing and shows him the secrets of the area. Along the way, they train their Pokemon together and Ash learns new battle techniques from Fantina. This encounter could also lead to Ash becoming more confident in dealing with Ghost - type Pokemon, which Fantina is an expert in.
One popular plot could be Ash and Macy teaming up to compete in a unique Pokemon tournament. They might face challenges like new and powerful opponents or tricky battle arenas. Another plot could involve them exploring a previously undiscovered region in the Pokemon world together, encountering rare Pokemon along the way. A third plot might be about Macy getting lost and Ash having to use his skills and the help of his Pokemon to find her, and during this time they both learn more about each other's dreams and fears.