From Bulbapedia, the community-driven Pokémon encyclopedia.
The Bulbagarden Library is a fan fiction archive hosted by Bulbagarden.
The Library is currently down, and was to return in an entirely differing style as part of Project Overgrow. During that time (and even while the library was up), many Bulbagarden users have taken to putting their fan fiction on the Bulbagarden forums. However, since Project Overgrow never finished, the Library is still down.
Bulbagarden Library front page (currently offline)