The next event is June 18 2009 through September 9 2009
arceus or shiny pichu event
I think 1/16/2009
Heart Gold and Soul Silver
Whenever it wants to be :D. You've been Lazered
there will be a next event on pokemon black and white
Arround in June or July
The next Pokemon Event for 2009 is in Japan for the release of Arceus. However, there is a mini-event in the United States between August 3rd, 2009 and September 23rd, 2009, for a Member's Pass so you can find and catch Darkrai at New Moon Island, available only by Wi-Fi connection using the Mystery Gift option.
AT TOYS R US THEY WILL BE GIVING AWAY EVERY POKEMON FOR ANY POKEMON GAME (I MEAN EVERY POKEMON GAME) ON AUGUST 16, 2009 EVEN ON GBA BUT THIS EVENT IS ONE DAY Only
Currently there is a shaymin event until November 8.
the next event i think is the darkrai event,i think its sometime in February celebrating the release of Pokemon 10 the rise of darkrai That was for 2008. Now it's Arceus. On July 18 2009 you can get him
Rotom Key April 20-may 17 2009 America
it's a Giratina movie/ Pokemon platinum (mascot:Giratina) 8-D