One possible story could be that a trainer has too many Eevees due to some unexpected breeding or a special event. They can't take care of all of them, so they put them up for adoption. Another idea is that a Pokemon rescue center has a box full of Eevees that were found abandoned in the wild, perhaps because their previous trainer couldn't handle their care anymore.
Young trainers would be excited. They'd see it as a great opportunity to start their journey with a unique Pokemon like Eevee. They might rush to the adoption place, full of enthusiasm. Some experienced trainers, on the other hand, might be more cautious. They'd want to make sure they can handle another Eevee in their team, considering their training style and the other Pokemon they already have.
Well, perhaps Naruto is sent to a dimension where Eevees are the main inhabitants. He has to adapt to living with them. He could form strong bonds with individual Eevees, like an Eevee that's really brave and they go on adventures together, exploring the new land and facing challenges that are unique to this world of Eevees.
The motives could be quite complex. Maybe the writer wants to show Serena's strength in a different way. By putting her in a seemingly helpless situation like being tied and gagged, it sets up a scenario where she has to use her wits and inner strength to get out of it. It could also be a form of character study, to see how Serena would react in a situation that is completely opposite to her normal, confident self in the Pokemon series. Additionally, it might be an attempt to add some edginess to the otherwise relatively family - friendly Pokemon fanfiction world.
A possible plot could be Lorelei training a new and rare Pokemon. For example, she discovers a shiny Eevee in a hidden part of the Sevii Islands. She decides to train it, facing various challenges along the way, like other trainers trying to steal it because of its rarity.
It could be a mystery where something valuable is hidden in the box. Maybe a key to a treasure or a secret document.
Well, it could be that the Arcanine is injured. Maybe it got into a tough battle with a powerful opponent in the fanfiction world and is in pain, thus whimpering.
Well, it could be a plot where Naruto is suddenly transported to the Pokemon world. He might team up with some Pokemon trainers, using his ninja skills to help them in battles. Maybe he'll befriend a Pikachu-like Pokemon that has similar spunk as he does.
It could be that a small group of fans have a very strange sense of humor. They find the idea of Pokemon having normal biological functions in a fictional and somewhat comical way. However, this is far from the normal or expected fanfiction topics. It might also be that they are trying to break the boundaries of what is considered normal in fanfiction, but it's not a very appealing or widely - accepted approach.
One possible plotline could be Olivia going on a Pokemon journey with a new trainer named Lemon. They might face various challenges together, like battling tough Gym Leaders and trying to catch rare Pokemon.
In the Naruto Banished Pokemon Fanfiction, it could be that a powerful villain has the ability to control Pokemon and is using them to attack Naruto's world. Naruto, having no other choice, decides to banish the Pokemon to a different dimension to stop the attacks. However, later he discovers a way to break the villain's control over the Pokemon and has to go on a journey to bring them back and form an alliance with them to defeat the real enemy.