The meter for Renzokuken is kinda confusing. When exactly are you supposed to hit the trigger? I hit enemies four or five times alright, but I'm never able to get the good attacks like Rough Divine or whatever.
First of all, do away with the meter and set the "Trigger" command to auto. It makes your life so much easier. I believe you do that in Squall's stats menu somewhere. Then you don't have to worry about gauges and pressing L1 or whatever it is. Second, the random ending to Squall's Renzokuken series (i.e. "Rough Divide, Lionheart, ect) are learned by upgrading your gunblade. If you stil have the basic revolver model, you're not going to get the good limit breaks.
Actually, that's not entirely right... Setting the gunblade option to 'auto' will fire the weapon automatically during battle, doing double damage; however, in Renzokuken, Squall is automatically in temporary Beserk status, so he just whacks indiscriminately without firing. You need to set the gunblade option to 'manual', then press the confirm button just as the line on the gauge is entering the 'target area'. Doing this perfectly will greatly boost your chances of getting a special move; also, firing manually doubles the amount of damage that the hits will cause.