User blog comment:Tepig921/SSB3DS Leaks Fully Confirmed! My Bionis is Ready!/@comment-27859332-20140824001150/@comment-4115159-20140824032621

Good reason? Dude, joke characters aren't put in with rhyme and reason. There's real strategy involved.

And before Smash 64..
 * Wii fit Trainer - Nobody wanted her
 * Rob - Nobody wanted him
 * Mr. Game and Watch - Nobody wanted him
 * Captain Falcon - Nobody wanted him

The Duck Hunt Dog, if he's in, will just be another joke character that nobody specifically wanted. He's not there for the controversy or anything he's just thrown in for a laugh, regardless of how people will use him.