so while doing boss awhile ago to my surprise my entei guardian boss is not yet in cd, I always do all bosses in one day so it should have been ready to battle...
then I checked my boss checker and saw the new boss George is ready to battle, then I remembered that I fought him 2days ago.. I checked him up and was able to battle and won
here's proof that I was able to fight him twice in one week prior to its release
won 2toxic orbs and 30k+