The Wi-Fi event kicks off on Friday 25 January, enabling players to download the Legendary Water/Fighting type Pokemon Keldeo, who is a member of the Swords if Justice along with Cobalion, Terrakion, and Virizion.
This Keldeo knows the moves Sacred Sword, Aqua Jet, Hydro Pump and Swords Dance but once you have the colt Pokemon in your party you can also complete an in-game event that will teach Keldeo its signature Secret Sword move and reveal its Resolute form.
This Wi-Fi event is only open for a limited time and you've got until 12 February to download Keldeo for your copy of the game.
How to get Keldeo
First up, obviously you'll need a DS, DSi, DSi XL, 3DS, or a 3DS XL plus a copy of Pokemon Black 2 or Pokemon White 2 to get hold of it. You must also have no more than 11 Wonder Cards in your possession.
Then you need to begin your game and select Mystery Gift from the main menu. Next, select 'Receive Gift', followed by 'Yes.'
Following this step, select 'Get Via Nintendo WFC' then 'Yes' and the level 50 Keldeo will appear.
Now you need one open spot in your party (no more than five Pokemon) and then you just need to speak to the deliveryman in a Pokemon Center to collect your Keldeo. Finally, save your game!