Let's clear some things up a bit...
To lose that last little bit of fat you cannot just do abdominal exercises... You can't smash the fat away... You must do cardio work out along with some form of weight lifting... To lose weight try doing interval training...
The fat that is stored in your little "pouch" is the first place fat gets stored when you eat... so that means it's also the last place it gets used... That's why it's so hard to lose that little bit... Now if you do interval training along with weight lifting (I suggest Functional Training) you could increase your fat burning because muscle can use fat as energy....
Then there's the whole diet aspect which I'm not going to touch because if you're an moderately active person you'll require more calories, etc, etc....
And if you want to work your abdominal muscles remember.. there are 4 adbdominal muscles and each one as to be worked a special way especially the transverse.
But I've cover the very basics so if anyone wants more info, feel free to message me... I got articles up the "ying yang" that I would be more than happy to share...
G'Luck
DeX