Yep. Just Nintendo events or cheating. So . . .
Also dont expect another Nintendo event in the future, At the Pokemon Center here in New York the Machine were converted for the new versions, and im going to assume that the other machines have been converted too. I was lucky enough to get one (two actually got one for a freind too) when they held the event.
The only other option is Gameshark (or other cheating device) but use at your own risk, you risk the chance of ruining your game with the use of such devices.
One of the privilege of being a Mod, replying to closed topics 8)