Originally Posted by Fat klock
When is the soonest you can start RNG'ing for nature/IV's in B/W? I'm going to start on my White cartridge and I want to have the perfect pokemons asap
Technically you can do it immediately, but for practical purposes you can do it once you get the C-Gear and can trade Synchronizers/Chatot/etc. to your game.
Also, since this is a 5th gen question you should ask in the 5th gen thread