FlickBook is a cell animation toy. It requires a DLDI device that supports writing, so patch in the normal way.

You can move the drawing area and tool windows by holding ‘down’ on the D-pad or ‘B’ and then dragging the area around with the stylus.
You can zoom in and out of the drawing area by holding ‘up’ on the D-pad or ‘X’ and then dragging up and down with the stylus.
You can scroll through the animation frames by holding one of the shoulder buttons and dragging left and right with the stylus.

http://forum.gbadev.org/viewtopic.php?t=14023