Well, in this fanfiction, Ash as an Eevee could end up in a Pokémon center. The nurse Joy there is confused by this strange Eevee that seems to have an understanding beyond that of a normal Pokémon. Ash tries to find a way to communicate his true identity. He might get into trouble when other trainers try to catch him, thinking he's just a regular wild Eevee. Meanwhile, his Pikachu is on a search for him, and when they finally reunite, Pikachu has to figure out how to turn Ash back to his normal self.
The plot might involve Ash turning into an Eevee and being found by a group of Eevee and their evolutions. They initially view him as an oddity since he has the memories and some of the behaviors of a human. Ash, as an Eevee, could then learn new skills from his new companions and use his knowledge from being a human trainer to help the group in various situations, such as finding food sources or avoiding predators.
A common theme is the exploration of the Pokémon world from a different perspective. As an Eevee, Ash sees things in a new light. He experiences the Pokémon world on a more intimate level, like understanding the language of Pokémon better. There's also the theme of adaptation. He has to quickly adapt to his new physical form, which includes learning to move, run, and use his new Eevee - specific abilities.
His other Pokémon like Charizard would be completely bewildered. Charizard might initially think that this Eevee is just some random Pokémon near its territory. But when it senses something familiar about the Eevee, it would be hesitant and curious. It could try to communicate in its own way, like using small bursts of fire to get the Eevee's (Ash's) attention. The Pokémon that Ash has a closer bond with would be more determined to figure out what's going on and how to help him.
I'm not sure of the exact name, but there's a fanfiction where Ash turns into an Eevee and gets caught by a trainer. This one is really unique as it shows the Pokémon world from the perspective of a captured Pokémon. Ash has to use his knowledge as a human - turned - Eevee to escape and also tries to communicate with the other Pokémon in the trainer's team. It's a great read for those who like a different take on the 'Ash turns into an Eevee' concept.
At first, Ash and Eevee might be a bit cautious around each other. Ash is excited to have caught a new Pokémon, but Eevee is in a new and strange environment. As they start training together, they build trust. Eevee might learn new moves from Ash's guidance, and Ash learns more about Eevee's unique abilities.
One common plot twist could be that the Eevee turns out to be a shiny. In many fanfictions, this adds an element of surprise and rarity. Another could be that the Eevee has some sort of special ability that Ash discovers later, like being able to communicate telepathically. It might also be a plot twist if the Eevee is actually a key to unlocking a hidden power within Ash himself.
Another theme is Eevee's evolution. Many fanfictions explore different ways Eevee could evolve and how that affects its relationship with Ash and their adventures. For example, if Eevee evolves into a Vaporeon, it might lead to underwater adventures. Also, the theme of friendship and loyalty is always there. Ash and Eevee rely on each other, and this is often a central part of the stories.
Well, if it's a lemon fanfiction involving Ash Ketchum and Eevee, it's likely to be a creative and perhaps out - of - the - ordinary story. Lemon in fanfiction often implies a more adult - themed or romantic - leaning content, but in a non - official and fan - created context. However, this kind of fanfiction might not be in line with the original spirit of the Pokémon franchise which is more family - friendly.
One great 'Ash starts with Eevee' fanfiction is 'Eevee's Adventure with Ash'. It shows Eevee evolving in unique ways under Ash's guidance. Another one could be 'Ash and Eevee: A New Bond' which focuses on their initial meeting and how they form a strong connection that helps them in battles.
One possible plot could be that Ash suddenly transforms during a battle. His Pokémon friends are shocked at first. But then they realize he has gained some new Pokémon - like abilities. For example, he could communicate with Pokémon in a whole new way, understanding their deepest thoughts and feelings. This new form of Ash could lead his Pokémon team to victory in a big tournament, facing off against tough opponents and using his unique abilities to outwit them.
The plot could start with Ash stumbling upon an ancient artifact or a cursed place. As he touches or enters it, he is suddenly transformed into Latios. At first, he struggles to control his new form and powers. He might accidentally cause some chaos in the Pokémon world. His friends then set out to find a way to turn him back. Along the way, they encounter various obstacles and meet other Pokémon who either help or hinder their quest.