How It was made:
The robo jump, walk cycle, run cycle, and kick are frame by frame animation while the BG, robo arm and other movements are done using motion tween. Each and every scene will be created in a separate .fla file and convert the scene into graphic symbol and finally import it to the main flash(movie) file.
BG motion: At 17:00 secs in the video the background was split into three parts front, middle and rear. Always in reality the front most part will be moving faster than the middle and rear. So accordingly you can set the required speed that matches your character walk speed.
Extras: If you would like to download the walk cycle, run cycle as shown in this movie please download it from here.
Cam used: Virtual Camera AS 2.0