So for anyone on 10.6 and 10.7 without an exploit game wanting to downgrade I believe this works. Its NA only obviously
You can buy the game on Nintendos web store
http://www.nintendo.com/games/detail/eYURHNjVdfyrnA3OJGfmlMYIrJUzgOcv
when you buy the game it gets sent to your 3DS homescreen...