Is there a easy trick on catching Mewtwo easily?

Well you have to get mewtwo's hp to 1 and then throw twelve ultra balls. If it didn't catch Mewtwo yet either heal your pokemon's hp or keep on switching it. Then make sure it heals with recover all the way to 1 above it whole hp then throw a ultra ball and do the following:hold a or press it fast and then first right when you first throw the ultra ball and hold it until the ultra ball moves tom left and that very second do left then right then left or down and it (the rest of the following: instructions is the same when the ultra ball turns someplace you do the same thing as the ball does until the end when it doesn't move do left or right.) (25% to work so it is kind of lucky for it to work.) (Also if you want edit all the things that don't make sense)