clodoveo

Hey guys I am new to DS "hacking" I used to be pretty good with PSP homebrew etc...however anyways, the only thing I want to do is Play and patch or download Pokemon blaze black 2: Money is not issue, I have a 3ds xl brand new, pokemon black 2 original game (Although I will prob need a rom? ) What else do I need? I heard I need a r4 card? Or sdhc? If so which exact ones do I need? Please link me if you can?