There is a Black and White Mystery Gift that is an egg. Here the thing it is a random Pokemon so hope you get lucky. This event starts on December 17th 2010 and end on January 11th.
On Serebii they post that the Shaymin Event for Pokemon Ranger Guardian Signs. This event is called Rescue the Lost Shaymin. You may transfer it to DPtHGSS. If you send it to PtHGSS, it will change forms. This start on 15th of this month and the ending date is unknown.
OT: Oblivia
ID No: 10040
Attack: Defense Curl, Magical Leaf, Leech Seed, Synthesis.
Source: www.serebii.net
