Team 7 is definitely one of the best. Naruto's journey from a nobody to a hero is central to the story, and his relationship with Sasuke, who has his own dark path, is a major plot point. Sakura's growth from a girl with a crush to a strong kunoichi is also an important part of their team's story.
Team Asuma is a great team as well. Shikamaru, with his high intelligence and lazy - but - when - needed - to - act attitude, Choji and his strength related to his eating habits, and Ino with her mind - related jutsu. Their bond and their teacher Asuma's influence on them play a significant role in the story.
The combination of two popular franchises makes it interesting. Naruto's action - packed ninja world and the colorful Pokemon world blend well. Especially when shiny Pokemon are involved, it adds an extra layer of uniqueness.
One great 'naruto shiny pokemon fanfiction' is 'Naruto's Pokemon Adventure'. In this story, Naruto finds himself in the Pokemon world and starts his journey with a shiny Pikachu. It's really exciting as he uses his ninja skills along with Pokemon battles.
In fanfiction, shiny pokemon are often sold through underground markets or exclusive auctions. These sales are usually hush - hush due to the high value and sometimes illegal nature of trading such rare pokemon.
There's no way to determine who created 'first shiny stories' without more information. It could be a new and emerging writer who wanted to start a new trend with their shiny - in terms of being unique or eye - catching - stories. Or it could be a group of children who made up the first simple but shiny stories as part of a school project.