hm, then it's not going to have perfect legality with the method I suggested (since you'll be able to get the other egg moves with the sketchable moves). I checked the thread and RTL is right about:
"Sure, if you have time. Type this up:
x 226 413 383 65 420 196 466 355 181 318 166 191 55|x 226 413 383 65 420 196 466 355 181 318 166 191 55|x 226 413 383 65 420 196 466 355 181 318 166 191 55.etc
Just keep doing this. X stands for the sketched move (so for each x, do 1 through 559 except 448 and 165). Each is seperated by | bracket."
However, with some clever use of Excel for columns and Word's ability to replace characters with linebreaks/linebreaks with characters it should be possible to generate perfect legality.
Orrr.... yes. Since it breeds with Smeargle (otherwise Sketch can't be an egg move), simply move all other egg moves to level up moves, as they are legal with everything. It'll look a bit messed up in teambuilder but will have perfect legality.