You know that cafe not to far from the Center? That's where the gym is. They give a discount to anyone who's earned the badge.

Anyway, more importantly, there's one key difference between this gym and most of the others: There's three guys who run this one. Chili, Cress, and Cilan, who specialize in fire, water, and grass-types respectively. Trainers can pick who they want to battle--or there's the option to take on two of them, or even all three. Heck, you could even have tag-team sorts of battles with a friend or two if you really wanted.