this question is irrelevant since it is 2013
The next Mystery Gift for Pokemon Soul Silver will be Celebi (Serbii). Starting March 6, 2011.
It will be a mewtwo in black and white via nintendo wfc from feb 12 to an unknown date
regigas
As of Oct. 15 the next mystery Gift will not arrive for about 3-4 months, when the next Pokemon movie is premiered. You must take your DS to the theater and set it on something Like "Find Mystery Gift Via Wireless".
riolu
it would probably be this year
it is on June 14 2008
Nintendo doesn't give the mystery gift to you. You can get it by yourself. First, go to 3f of the jubilife tv station. Then talk to the man next to the woman. Type in on the first two everyone happy. Type in on the next two wi-fi connection. Then he gives you the mystery gift. Save, turn your ds off, then on on the screen where it says new game mystery gift is an option.
If by "mastery gift" you mean "Mistery Gift," then go to any PokeMart in Pokemon Emerald, FireRed, or LeafGreen, and talk to the questionnaire at the counter near the guy. Input the words "link together with all."
acures i think im not sure
When the Arceus movie which is coming soon to DVD comes out.
acreus on 10-27-09 it will be avalible on Nintendo wfc mystery gift for more in fo go to Pokemon.com