No, save at the entrance to the cave (not in the cave, but just before entering it). Calls don't work there, so you have to be outside the cave.
You'll need to do a quick calibration to see what is starting frame is (normally, its 1 but since you have to do some walking it can change). To do this, synchronize the DS with your second hand watch/clock/whatever. Enter the game, and go straight in and catch Groudon. In seed finder, put in the needed info (remeber, the minute is when you entered the game, not started the battle). You'll need to get the exact IVs for it. Once you've found the spread, press okay. Then find out what frame the one you caught was on by searching through the list on the main page (shouldn't be past frame 15).