pokemon white and black do support WPA connections. You need the actual gamecard and need to be on a DSi, DSi XL/LL or 3DS. If you are on a flash card it wont run the game in DSi mode so you'll only be able to connect w/ WEP
You can configure in the DS's settings, choose advanced settings on a SDi+DSi XL/LL?
You can configure in the DS's settings, choose advanced settings on a SDi+DSi XL/LL?