Here comes the hard part. Highlight your frame and look to the left of the blue bar. There should be a number (the frame number) and a time.
Let's say your time is 3:15.49, just as an example. Set a timer to 3 minutes and 15 seconds, or watch a clock. Reset (A + B + Start + Select) the game and start the timer at the same time. If you're watching a clock, reset right when the clock gets to the next minute. Enter the game, and talk to the daycare man. Collect your egg, and click through all the dialogue until his very last phrase, which is "See you next time" or something like that. When you press A, ending the dialogue with the daycare man, the Egg's IVs will be completely set.