Well, I've seen a Naruto Shippuden: Ninja Destiny 2 Topic for AR Codes, but I didn't see anyone post them.
Go here and Find the Forum Make sure you read the Rules and Topics first Before Posting...And as for Naruto Shippuden: Shinobi Retsuden 3, you're talking about the Japanese version of the Game, right? Because there are already AR
Cheat Codes for this game...Check closely...(
http://cheats.gbatemp.net)