If you're good... you only need one bowling ball, and only one try per frame.
I am sure you mean this in a farcical sense.
I have been a bowler for 30 years and have never met a “good” bowler who came to the lanes with one ball.
Even mediocre bowlers today come out with at least two balls.
Only a novice or a purely uncompetitive (one there to socialize) bowler brings one ball to the lanes.
With the modern lane conditions and highly technical ball materials you can not be competitive with one ball.