Notes:

From http://imgur.com/gallery/UYfJgKj/

( I don't know what is happening but somehow this picture is taken down constantly, let's just hope it doesn't get removed again. )

I was kinda bored and I was f------ around with the codes of SSB4 ( 1.0.7 ). I found this image, ( SSB4\ui\replace\soft\soft_25\soft_25_Mother_3.nut ) along with another image ( isn't that interesting, it's just the same picture but then when it's selected, I'll post it if there is any demand for it )
Now, what is interesting, is that for those who don't know, Mother 3 is a Japan exclusive game. So this will probably mean this game will be localized and will be released on the Virtual Console at some point.
Also, please note that this was found in the PAL version of the game. I'm not sure if this is also present in the NTSC version, I hope I can find out soon enough. Edit: There is no specific date because that's just with every game in the masterpieces section. They only say the year that the game has been released. I hope I can find the same images in the NTSC version so I can provide you guys with a specific release date.