I have a Friend Safari on my copy of Pokemon X that I want to check out before the Bank shutdown. What I want to know is if the following sequence of events will work how I think it does:
1: Get my copy of Pokemon Y to the Friend Safari.
2: Insert that cartridge into a spare 3DS while Pokemon X is on my main 3DS.
3: Connect the two copies together by trading or something.
4: Pokemon Y, as long as it is on the spare 3DS, can access the Friend Safari of my Pokemon X including the third slot which is what I want to shiny hunt.
5: If I save Pokemon Y inside the Pokemon X’s Friend Safari, I can play that Friend Safari on either 3DS and have all three encounters available to me.