I have an outdoor pond. I think that my electrical connection got wet and shorted out.
My question is, I changed out all the receptacles on the gfi circuit and only two work. Is it possible that the breaker is bad and does not supply all of the circuits now??

Your statement/question is a bit confusing, is the problem with one outlet, one circuit, or multiple outlets or circuits?

If the breaker for that one circuit was defective, none of the outlets on that circuit will work.

You think the connection shorted? Why do you think that? Did a circuit breaker or GFI trip?

If you changed all the outlets, and now only a couple of them work, I think you have a bad connection in one of the outlets that feed the dead outlets.

If this helps, great, if not , please get back with more clearer details.