What is Pokemon Twilight?
Pokemon Twilight is a fangame featuring over 200 original Pokemon in a brand new region! Its final release will feature two versions, Solar and Lunar. These versions will differ like the official Nintendo games, so you will have to trade online to get all the Pokemon. Pokemon Twilight is integrated into the Game Fortress Forums to allow easy trading and (eventually) battling with your friends, no friend codes needed! Follow the above links to find more information about the game and download the latest demo.
The next major update is planned for 2014, after it is released the game will resume regular updates.