Maybe Snivy is a wild Pokémon and Servine is a Pokémon that has been with a trainer for a long time. Servine gets lost during a journey and Snivy helps it find its way back. During this time, they fall in love. This plot can explore the differences between wild and trained Pokémon's worlds.
You can try some popular fanfiction websites like FanFiction.net or Archive of Our Own. They usually have a large collection of Pokémon - related fanfictions, including ones about Snivy and Servine's relationship.
A more emotional plot could be where Snivy gets separated from its group and is found by Servine. Servine takes Snivy under its wing. As they travel together, they face misunderstandings from other Pokemon because of their different natures. But through it all, they develop a strong bond that helps them face any difficulties.
For Snivy, you can show its growth from being a bit naive to more confident. For example, at the start, it might be hesitant in battles, but as the story progresses, it becomes bolder. Servine can be developed as a more mysterious character at first, with its past gradually being revealed as it gets closer to Snivy.
Once upon a time, there was a Snivy named Lily. She was a shy and gentle Snivy. One day, in the forest, she met a kind-hearted Pikachu named Sparky. At first, Lily was a bit afraid of Sparky because he was so energetic. But as they spent more time together, Lily started to see Sparky's true nature. Sparky would bring her delicious berries and protect her from wild Pidgeys. Their friendship slowly turned into love, and they became an inseparable couple in the Pokémon world.
In many fanfictions, Oshawott is often depicted as being very loyal and brave in the context of its love for Snivy. It might be shown as being willing to face any danger to protect Snivy.
They are popular because of their distinct personalities. Snivy is often seen as cool and collected, while Oshawott is cute and energetic. This contrast makes for interesting character dynamics in fanfiction.
Once upon a time, in the Pokémon world, Oshawott was a little shy around Snivy. But every time they met during their trainers' journeys, Oshawott would find himself stealing glances at Snivy. Snivy, on the other hand, was initially indifferent but gradually noticed Oshawott's attention. One day, they got separated from their trainers in a forest. They had to rely on each other to find their way out. During this time, they started to communicate more and found out they had a lot in common. Oshawott would use his shell to protect Snivy from the wild Pokémon, and Snivy would use her vines to help Oshawott reach for fruits. By the end of their adventure, they became very close friends and a budding love started to form between them.
Snivy love fanfiction also appeals because it can explore different types of relationships. It could be a simple, innocent puppy - love type of story between two Snivy, or a more complex relationship between a Snivy and a trainer. These different relationship dynamics can draw in readers who are interested in various aspects of love and friendship within the Pokemon universe.
One good example could be a story where Snivy and Oshawott go on an adventure together through a mysterious forest. They encounter different Pokémon and have to work together to overcome obstacles.