Cart before the horse... you have to pass the bar before you get the chance to represent someone semi-competently in court. Generally, lawyers have 5 years of experience before they are considered competent enough to be semi-competently represent someone in court.

Most states also require a law degree in addition to passing the Bar.

But a fun fact is that magistrates generally aren't required to pass the Bar, nor hold a law degree. Most states require extremely basic courses of 40 or so hours of training. I know of a magistrate that has tried numerous times to pass the Bar and has failed. I'm not sure how much competence our system mandates.