On Nov. 1, 2011, as part of the v4.7 update, the Avatar Store was released as a new addition to the Pokemon Center. The only option at the store for the time being is the Halloween Avatars.
Halloween Avatars (All 1 SnD Coin)
|Gastly Mask (also available as v4.7 Mystery Gift)|
|Duskull Costume (also available from the Game Corner for 150,000 Casino Coins)|