I am not a trainer or even remotely qualified to answer this, but in my humble opinion, I think belly fat and bloating might be two separate issues. Belly fat really depends on the individual's BMI, age, gender, calorie intake, exercise program, etc.
Bloating could be as simple as not rinsing your beans properly. It's really hard to give any advice on bloating without knowing what you eat in detail. Also how much you eat (daily calories) and the quality of those calories, fat ratio, oil content, sugars, salts, processed foods, everything. There's also a chance you have a food intolerance, even. You could always try eliminating certain foods in your diet to see if one specific thing is causing the bloating.
If you're training and trying to get rid of that last bit of tummy fat, you will need to clamp down on your diet, no question. There's a few vegan YouTuber's that train/bodybuild. I'd have a look and see what they're doing.