Maybe a Jigglypuff could be in the bathroom during bath time. It could start singing its sweet song, which makes the bath time even more relaxing for the trainer. Meanwhile, a Psyduck could be splashing around, not really understanding what's going on but still having a great time. And the trainer could be sharing some bath toys with these Pokemon.
By giving them unique bath - related quirks. For example, Meowth could be obsessed with keeping his fur perfectly groomed during bath time, using his claws as combs. This would make him an interesting character as he scolds the other Pokémon for splashing too much water and messing up his grooming session.
One idea could be that Pikachu accidentally slips into the bath while chasing a floating Pokeball. It creates electric sparks in the water which turn the bath water into a mini electric pool, but without harming anyone. The other Pokémon gather around to see the strange phenomenon and it becomes a fun bath time adventure.
A more complex way would be to have a portal that moves Pokemon across great distances and through time. A young trainer could accidentally step through this portal and find themselves in a strange new region with Pokemon they've never seen before. As time passes in this new place, the trainer has to figure out how to get back home while also learning about the new Pokemon and the secrets of the portal. This would create a lot of opportunities for adventure and discovery in the fanfiction.
One way is through the dialogue. Make the characters use simple words and phrases, like a child would. For instance, instead of complex battle strategies, a trainer might say things like 'Go, Pikachu! Make it go boom!'.
One idea could be a magical bath time. In the fanfic, the character could discover that the bath water has special powers, like making them able to communicate with mythical creatures that live in the drain. For example, they might meet a tiny mermaid who gives them a pearl as a gift.
One way Naruto aura could be incorporated into Pokemon fanfiction is through a crossover of abilities. For example, a character might have the ability to use Naruto - style chakra, which they could then use to enhance their Pokemon's attacks. This could add a new layer of strategy and power - up to battles in the Pokemon world.
You can start by setting a normal Pokemon scene, like Pikachu playing with other Pokemon. Then, introduce an unexpected element, such as a new and strange Pokemon suddenly appearing. Pikachu's reaction to this would be like the meme. For example, if a giant, rainbow - colored Snorlax showed up out of nowhere, Pikachu would be very surprised.
One way is to give the Xenomorph - like Pokemon a unique typing. For example, it could be part Dark and part Poison type. This would make its attacks and weaknesses different from regular Pokemon. Another way is to have it with an ability that is related to its Xenomorph nature, like being able to move quickly through vents or small spaces, similar to how Xenomorphs do in their original lore. You could also make its evolution method really strange, like it evolves when it 'infects' a certain number of other Pokemon.
In the fanfiction, there could be a lemon grove that is in trouble. Some dark - type Pokemon are causing problems there. Bulbasaur, being a heroic Pokemon, decides to help. It uses its plant powers in combination with the lemons in the grove. For example, it might use the lemon juice to make a slippery surface to trip up the bad Pokemon or use the lemon peels to create a shield against their attacks.
They could be incorporated by having the humans use bath bombs as a form of celebration. For example, when the Autobots achieve a major victory, the humans decide to have a party and use bath bombs as part of the celebration. Optimus and Ratchet are invited to join. Optimus might see it as a way to bond with the humans further, while Ratchet would be more interested in the scientific aspect of how the bath bombs work.