I also found one of my best matches this morning, the person I've played more in a row than anyone else. We started with many, many games of my Lucina vs their Shulk. Eventually I tried out my Palutena and Pikachu and some others. At some point I killed myself to even the match after an SD fumble, but then they returned the favor after getting a clean kill on me, so from there we just started SD'ing after the first kill to play the last stock evenly. It was great, and we were a perfect match I think... although it took me way too long to get used to their Samus. It seems like we must have done 30-40 matches. I kinda wish the 3DS friend list had a 'recently played with' function like the Wii U.