Couldn't tell you for sure because I didn't test it and and don't remember, but I would be very surprised if it didn't. Every other game has done that and the ramifications otherwise are too big. If this is BW2, then you could have done spinner calibration, which does require a save but not IVs. I misread your original message and thought it was shiny, so your SID is irrelevant here. We'll never know for sure.does the game save after an IR trade is completed?