There is no information available on Nintendo holding another Secret Key event in the future.
by secret event which is over... sob i missed it also
Already happening............
I'm sorry to dissapoint you, but the Secret Key in Pokemon Pearl is an event item, which means you can only obtain it during a Toys "r" Us event or by cheating.
there was an event for it but it is gone. you can also cheat. (action replay)
obtian the mystory event
it already past it was in January 31 2010
you get the secret key through a special event. I'm really sorry but the event is already over. i checked last week. they say it ended over 2 weeks ago.
you need to have the event (dont know what event it is) hope it helped
Since the event for the secret key is over, there is no way to get it other than hacking. And no, you can't trade it from a friend since it's a key item.
To get the secret key, you can go to nintedo wifi and mystery gift there
There is a cheat for obtaining the Secret Key. You can use Action Replay Codes for WI-Fi Event Items.