Rainbow Pen on DSi
Press the pen icon on the touch screen when you are in Pictochat on the DSi and keep pressing until it starts to flash different colours. When this happens draw on the touchscreen and your pictures will be drawn with a rainbow effect. This works only on DSi but the rainbow images can be sent to the DS Lite and DS.
More tricks, tips and cheats for this game are right here - PictoChat cheats
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