This is basically the paranoid of (not created by me) "Your FUUUUUUU moments." So let me tell you mine. I had finally found Virizon. The thing was I had no Master Balls. I get it at red health, waste a Dusk Ball, Great Ball, and about 10 Ultra Balls- and I chuck my last Ultra Ball, Timer Ball at hand just in case. The ball shakes- and it is caught. I had caught a legendary Pokemon without a Master Ball.