Kazuya_UK:
Sissy requires the same move over and over (double jump over and combo from behind), but there is also a totally cheap and nasty way to beat Johann. Just knock him over once (I usually just tag my partner in when he is in the middle of a move) and as he is getting up, jump in and kick him... you must make sure you hit him quite low though as that is the key. He will block, but as soon as you land just sweep him. This will knock him over again, and all you have to do is lather rinse repeat until he dies. Takes a bit of practice and timing, but I have completed the game with every team using this cheap-ass method
Kaz
OK, cool, I'll try that, it sounds easier than my method (max power gauge, SDM SDM SDM, I don't always connect, so he still kicks my ass).
Another really really easy way to beat Sissy is just do
any shoryuken type move when she charges at you with a drill kick... you'll cancel her out everytime. Just watch out for any frogs that happen to be jumping around, if you land on one, you still take damage. Chinnen's got a really long arc, so you can usually avoid the frogs with him.
(I learned this method from a guy named 'Pip'. Pip, if you're out there, thankee pardner.)