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
Rotom Key April 20-may 17 2009 America
it's a Giratina movie/ Pokemon platinum (mascot:Giratina) 8-D
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
Sadly, there is no other way unless another event happens or you cheat your way through it. As far as i know, the Pokemon events for Diamond and Pearl have already passed. Events are occurring at the moment for Platinum version however. The event for Darkrai will last from August 3rd 2009 until September 13th 2009 through Wi-Fi. I have also heard an event for Shaymin will happen once again for Platinum players at Toys-R-Us sometime in mid-October.
English Pokemon platinum comes out in 22nd of may 2009