Where are you in your Black or White playthrough?

[Dark Sage]

What a coincidence. I just caught Cobalion and Virizion.

They are quite hard to catch. Ultra Balls may not due the job, but Dusk Balls work wonders. (It was night when I caught Virizion, but its grove might count as dark enough even during the day.) You can buy them at the Pokemon Center in Driftveil.

Edit: I have a question of my own: has anyone managed to transfer Celebii and get Zorua yet? My second DS seemingly can't be used for the transfer. Granted, it's an old model, but it CAN run the game. Do I have to wait for the National Dex, or what?