Jirotrom said:see... I do the lariat over and over again... I can get a few perfects... but Ultras dont happen...
What I did to get this is set it to 3 rounds. This way the first round you can perfect him and the second round you can ultra him. I did this because sometimes when you try and build up ultra they kill you. this is only a problem on the hardest difficulty. If you're doing it on easiest to unlock gouken you can set it to 1 round.
I usually just focus attack charge in front of them then when they hit me I dash back. I let my life build back up then do it again. Doing it this way lets you keep your life bar up. Then when the meter is full I jump in on them. If they don't hit me I can ultra them. If they knock me down and are standing over me I can pull out an ultra.