Part one: The failed Dark Celebi attempt of Shadow TR
Part two: When the part one trainers walk out of the Ilex Forest, the defeated main boss, Evice lies on the ground, with what the heroes will think is a now broken GS Ball. The real main boss, who you may recognize from Pokemon Colosseum walks up to his defeated lackie.. This true main boss is Wes.
The true shadow power took over him, and his target now is Darkrai. In this one, Giratina is a good guy, and uses its powers to bring the heroes, maybe some old and some new ;D
But, yeah, Wes is also brought into this new universe, and then its time to rumble.
Obviously, this entire thing is still in the scratch phase.