I was more or less checking to see if the spoofer worked for me.Are you talking about the mystery gift Shaymin? Pretty sure you can get it without using Mystery Machine. And if you want the Mystery gifts, use Mystery Machine, select "Get via Internet" until you get the one you want.
https://mys.salthax.org/events/#a the Shaymin I tried was (0562)
Wait, how does the "Get Via Internet" feature work with the spoof?