If one of your goals is to get us to use the Pet Sparring Arena, I suggest that when the Pets fight, they gain experience. And, if they win, they get more experience. Right now, I use the Pet Arena for killing time (due to timers – hatching or getting energy) and/or getting Pet Gear and Snacks. I would probably use it more if my Pets got experience from it since they would go up levels faster.