Wat
Probably October 30th.
arceus or shiny pichu event
I think 1/16/2009
it is on June 14 2008
The exact date of the next Pokemon event has not yet been confirmed, but to find out keep up to date with this site: www.Pokemon.com
The next Pokémon Diamond event in 2010 will take place at Gamestop stores in the U.S. from January 30 until February 14. This event will allow you to download a special Pikachu-Colored Pichu otherwise known as a Shiny Pichu into your Diamond, Pearl and/or Platinum games.
Currently there is a shaymin event until November 8.
This month you can get Shaymin in the US and next month you can get Regigigas, the Shaymin event is February 8th-14th and the Regigigas event is March well I forget when it starts, but it ends on the 21st.
type in bulbapedia on google
Arround in June or July
The next Pokemon diamond/pearl event is the event of Darkrai, and it will be released sometime after the movie "The rise of Darkrai" premiers on CartoonNetwork on Feb.24th.when though i wanna know