The Scrap moves are really easy... after you've KO'ed your opponent (in the final round, in case you need two wins or more) and your bot does his victory pose, execute the commands for the Scrap. The easiest bot to perform a Scrap & Destruction would be Chronos (Down, Forward, Punch and Forward, Backward, Punch if I remember correctly). Jaguar is easy, too. The hardest bot would be Katana (Forward, Down forward, Down, Down back, Back, Punch, to Back, Down back, Down, Down forward, Forward, Punch. Both must be executed in a rolling motion). You can execute the Scrap anytime in your bot's victory pose (some bots can do the Scrap even before that, if you're fast enough) until all the bonus points are added to your score. Hope this is any help!
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