In sept 28th- nov 8th, shaymin will appear platinum...
i believe arecus will appear before 2010.
http://www.pokemonplatinum.com/#/pokemon/shaymin/
you need to download it at a Nintendo event
I think its out on September 13th 2009 which is on a Sunday
it's a Giratina movie/ Pokemon platinum (mascot:Giratina) 8-D
Rotom Key April 20-may 17 2009 America
There was no Shaymin event for Soul Silver, only Diamond, Pearl and Platinum, which ended on November 8th 2009
Wi-Fi event using mystery gift. Event already been in USA Event in UK/Europe: 8th June 2009 - 19th July 2009
You cannot get Oak's Letter in Pokémon Platinum without cheating since it's an event-only item. The only Oak's Letter event has already ended but it was active between September 28, 2009 and November 8, 2009.
Pokemon platinum comes out in the US on March 22, 2009
Pokemon Platinum comes out on March 22nd 2009 in the U.S
If i can remember it came out sometime in 2009 but awhile back im not 100% sure tho sorry
English Pokemon platinum comes out in 22nd of may 2009
Pokemon platinum comes out in Austraila March 22 2009