Generally one. However, a person might go to clinics and camps. They also might find a better coach and move on.

If you have a personal pitching coach one is enough. But as Ken said, there's nothing wrong on going to pitching camps to learn new things because learning sports skills is always changing to be able to learn the best technique to use.

http://www.softballperformance.com/articles/a-coaches-guide-to-softball-pitching-keep-it-simple/

I should add that ideally, you pitching and team coaches should be the same. If not, I'd hope the team coach is in kahoots with the pitching coach so they're both on the same page. I try to attend every practice I can with my primary girls, and try to hit every game possible.

um it depends on how bad they r ot how good but my cousin ishelping me on my pitching and she pitches 90mph at least and its fast my aunt has to put padding in her glove because it goes so fast and it wears the padding down

Every pitching coach has a small or different idea of how to do it right; in fact, every Coach has an idea of what is right for them and there team. In saying that, I believe that you find a solid coach that gives the base foundation and that can work you to a certain point of stoute fundamentals, then reach out and find a coach that primarily works on advancements in motion pitches. I have found over the last several years that this has really worked well for my pitchers.

W, I think you should have 1 coach and make sure that person knows what they are teaching.

Every personal pitching coach is different, teaching different mechanics. The changes and adjustments necessary to fine tune pitching require consistency. Practice makes perfect. Practicing different mechanics all the time will get a pitcher nowhere. Muscle memory is created by repeating motions again and again...a reason bad pitching habits are hard to break and good pitching habits are easy to keep. No muscle memory is created when repeatedly pitching with different mechanics. Therefore players need to be consistently taught the same things. Many, many small factors go into one pitch, ending up as one fluid motion. Each coach teaching each small factor differently serves no benefit. The same end result will never be reached until the pitcher puts the same smaller factors into every pitch. Use only one private coach for lessons. The player will otherwise be confused, and pitching will actually decrease rather than progress.

I agree. With more than one pitching coach the girls get confused and don't develope thier pithcing form and style. I also agree that the one pitching coach know his or her stuff.