PictoChat is a local chat that was developed by Nintendo for the nintendo ds. Though it’s more like a game than a chat.
The main gimmick is the drawing thing (hence ‘picto’). You draw pictures with the stylus and then send the message to the chat. You can even take other people’s messages and modify them. Regular text messages are also supported.
I never actually used it in its heyday because that required friends, who were located nearby…who owned a DS.