Congratulations on Pokemon X/Y eclipsing Super Mario 3D Land to become the highest selling 3DS game! It should be the first to pass 10 million by sometime in February/March if not sooner (Due to general post-holiday slowing of game sales).
1. Pokemon X/Y: 9.25 Million
2. Super Mario 3D Land: 9.16 Million
3. Mario Kart 7: 9.07 Million
4. New Super Mario Bros 2: 7.11 Million
5. Animal Crossing: New Leaf: 6.04 Million
Edit: I'd also like to thank Game Freak for finally giving Flareon 'Flare Blitz'. Who knows! Maybe in Gen 7 Pinsir might finally learn Mega Horn... And Dunsparce will evolve into a Fairy/Dragon...