This one is quite simple, and can be done in local Versus (need 2 controllers). Set the rounds to 3.
Choose Chun Li, and your opponent will be Karin. Do 8x QCF + HK which will stun her and leave her with a pixel. Simply finish with QCF + KK.
If you've played this a bit before, it'll go quicker. Otherwise, you'll need 100 fights.