The Unpluckable badge is new for NBA 2K20 and makes it more difficult for defenders to steal the ball from your player.
Unpluckable is a solid badge for any player, as it provides helpful protect ball animations. For guards, it’ll help you dribble better on the perimeter, and for big men, it will help you from getting ripped off rebounds and in the post.
Recommendation: Ball handlers should get Unpluckable on a higher level, and big men should get it on Bronze if they have sufficient badge points or frequently get ripped off rebounds.
Another course of action for guards, however, is simply using Unpluckable on only Bronze. Many top-level players, like Tyceno, use it on Bronze for the animation set and protect the ball by avoiding dribbling into their defender.