I don’t know if it’s been mentioned here, but I did this combo in an actual battle against sagat, but it should work against tall characters. I haven’t practiced it against all the characters yet, but here it is:
C-groove: …rh legs -> rh legs -> cr./st. mp -> lvl 2 super -> rh legs -> rh legs -> cr./st. mp -> lvl 1 super…
Buktooth mentioned something like that somewhere in this thread, I believe.
IIRC it only works on fat characters, plus RH LL > RH LL is a 1-frame link. Depending on the character you have to use s.MP since the c.MP would whiff (another 1-frame link). If you can pull it off consistently go for it, really good damage.
It’s not a link, it’s a cancel. You got to drum your fingers over the kick buttons really fast for the LL to come out. I’ve tried it in real matches but my fingers aren’t quick enough to get it to work consistently.