Style Savvy DLC for NoA in 2014. BELIEVE.
In all seriousness, bought it day one. I still play this game, usually when I need something quick, like waiting for busses, in Doc's offices, et al. Despite that, itt still hasn't topped the top 3 in my activity log (AC:NL, Pokemon Y, and FE:A). But I poured hundreds of hours into the first game, which still holds fond memories for me, so this one will catch up eventually.