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You can get pictochat on your ipod.
I had an original ds and a ds lite and both of them had pictochat.
you and 1-15 other people must be with in 65 feet or closer to each other and be on the same pictochat channel of pictochat.
Yes. From every DS, you can access PictoChat from the main menu.
You can be alone in pictochat, but you cannot communicate with anyone unless they are in the same chat room as you.