Well, The only way to get mystery gift is to do what u did. To get wi fi u need the wep key for your box that supply the internet eg netgear and when u r at the screen were your about to go on to your saved game go to wifi setting and search then put the wep key in.
Please use Proper English...
I have 5 Mystery Gift Jirachi's and would love to trade people for a Darkrai, Colored Pichu, Shaymin and any of the Rotom forms. I want legit ones. None that you obtained with cheating. Well, this is worth a shot so Glads of you.