All PictoChat Chat Rooms Are Full (Nintendo DSi/Nintendo DSi XL System)
Nintendo DSi
The information in this article can help you when all chat rooms are full in PictoChat.
What to do
PictoChat is capable of supporting up to four simultaneous chat rooms, each with a maximum of 16 users (64 total), within a 65-foot radius. If all of the chat rooms are in use, you will need to move to another area before you can access an empty chat room.