Thank you, that was exactly what I wanted to hear! If you'll indulge me once more, I'd like to go through the steps to make sure I have everything right.
-Have 2 parents in party, say 1 Garchomp (unknown IVs, but can find if they're necessary) and 1 perfect Ditto.
-Save in front of Day Care lady.
-Put parents in Day Care and remember order they were put in.
-Turn off DS, put in right time/date/etc., hit seed eventually.
-Do the right number of advances via Joey to hit, say, Frame 5.
-Bike up and down until Day Care man gets an egg, save in front of him, get egg
-Bike up and down to hatch egg, if it's the right nature/gender/ability/shininess, turn DS off without saving.
*Then* when I've confirmed the right PID:
-Set date/time/etc. to the specifics for the IV.
-Turn on game, eventually hit the seed.
-Do separate advances, assuming frame 3, get egg, hatch.
-Offspring is shiny with target IVs. (And there was much rejoicing)
Parially this is for my reference, in case my ADD kicks in and I forget a vital step, but I'd be very grateful if you'd confirm that my steps are correct.