There's a fanfic titled 'Oshawott and Snivy: A Unlikely Friendship'. It delves deep into how their different personalities, with Oshawott's boldness and Snivy's cool - headedness, create an interesting dynamic. They face challenges in the Pokemon world and grow closer as they overcome them. This fanfic really brings out the charm of their relationship.
I'm not sure of the exact name, but there's a fanfic where Oshawott and Snivy team up to find a rare Pokemon. In this story, they start off as strangers but gradually develop a strong bond as they travel through various terrains. The author does a great job of depicting their interactions and how they start to understand each other better.