
Originally Posted by
Poryhedron
Until recently, you had to go somewhere such as a Toys 'R' Us store in order to get anything...and what you got was the pokémon itself, despite the fact that there's hidden content in the game allowing you to explore special areas and find the pokémon in a scripted encounter.
These days, though, Nintendo has started handing out event-unlocking items through Mystery Gift, and you don't even have to leave your home! (Assuming you have WiFi in your home.) You just have to activate Mystery Gift on your 4th-gen game (which is done by giving certain answers in a survey at the Jubilife TV Station), and then you can use WiFi to connect to Nintendo's servers. Doing so will get you an item like the Secret Key or the Member Card; these items are needed to access special hidden content in your game. (This might only be doable with Platinum Version; I'm not sure.)