I have a T11 pet, really only because I've been here so long, because I don't really battle much. Today, I started poking around in the coliseum. Decided to get all of my default challengers that I can beat up to 10 wins, ended up unlocking most of the secret challengers and got those up to 10 wins and made sure all available Cash Shop challengers I already had were up to 10 wins.

Would you believe that gave me enough EXP to get 320 HP, not to mention 14 achievements?! Now I'm only a few hundred stats away from T12 and thinking I'm going to have to start buying the Cash Shop challengers each month. I think this is how I finally get into battling haha.

Congrats on all the EXP and stats! Welcome to the world of battling :D