User blog comment:Greninja Knight/Hidden Voice Clips discovered in Smash 3ds/@comment-5401852-20141011173945/@comment-25317463-20141012005825

but most leakers (who may or may not be legit) claim that some characters (if any, definitely Mewtwo, Dixie Kong, Ridley) are available on the Wii U version, but if you want them on the 3ds version you have to connect the two versions and transfer them there.