The only way to get it is through the enigma stone wi-fi event. Otherwise you need to hack or cheat.
Wi-fi event!
In a Wi-fi event.
No, there isn't another date to get the enigma stone. The enigma stone event has already passed. There most likely won't be another enigma stone event.
Wi-Fi Nintendo Event.
you look for it on the internent
A Wi-Fi event (not currently available in North America).
There isn't going to be one as far as anyone knows.
You can't unless you cheat
Check the back of the Enigma Stone Wonder Card.
Wifi Event but its over now
To get the enigma stone in heart gold or soul silver, You'll have to obtain it over a WI-FI event. I've heard there is a event going on right now which is giving away the enigma stone for free, but I bet it's gonna be over soon, or maybe it's already over...
you don't press anything there is an event at toys r us were you buy a Pokemon doll during the season a game comes out and they give you special stuff but heartgold has been out for a year so no enigma stone