What happens if a Pokemon with Sleep Talk and Protect uses Sleep Talk? Does Protect still have a chance of failing or will it always succeed?
Also, as Drdudeofbananas mentioned, what if the Pokemon using Sleep Talk is slower? How will that affect the use of Protect?
For the first question: you still have to go through the halved accuracy check
For my own question: protect that is not prioritized will fail.
boring answer, but thats how it is
Source: I tested it.