Here's how to get your Secret Key via Nintendo WFC April 20th through May 12th.
Step 1
Go to Jubilife City and talk to the TV Producer on the third floor of Jubilife TV. He'll ask for an opinion, answer him: "Everyone Happy Wi-Fi Connection". Then save and restart your NDS.
Step 2
Select "MYSTERY GIFT". Select "RECEIVE GIFT". After you select it, select "GET VIA NINTENDO WFC" and choose "YES".
Step 3
Go to any Poké Mart and talk to the deliveryman in green. He'll give you the Secret Key. Finally, save your game!
