Gaining

I really want to Get a ball belly, does anyone have any tips on how to achieve that?

Can only suggest the obvious really. Eat loads of large meals, plenty of fattening snacks and huge quantities of beer!
You can't be sure where the fat will end up but beer bellies aren't called that for nothing.

I have a forty-seven inch ball belly (visceral fat). I love desserts, mainly ice cream and baked (cookies, cake, etc.)

I do believe that genetics do play a role though.