Missed out on your chance to get the mythical Pokemon Keldeo back in September and October? Or are you just eager to get another one? Well, you're in luck, because from January 25th until February 12th, you'll be able to receive a Keldeo over the Nintendo Wi-Fi Connection in all international versions of Pokemon Black 2 and White 2!
This Keldeo is at level 50 and comes with the moves Sacred Sword, Hydro Pump, Aqua Jet, and Swords Dance. You can take Keldeo to the Pledge Grove behind Alder's house in Floccesy Town in order to teach it its hidden move, Secret Sword, which transforms it into its Resolute Forme as long as it knows that move.
You can find out more information on how to receive the Keldeo from Wi-Fi over at the official website.