For answers, we turn to a paper from the Society for Health and Human Values Society for Bioethics Consultation Task Force on Standards for Bioethics Consultation. The core competencies should be distributed among the consultation team. Consultation services need policies about access to the service, patient notification, documentation of processes, and case review. Abuses of power and conflicts of interest should be avoided. Ethics consultants should have the support of their institutions.
Evaluation is needed.
There need be no certification programs for individuals or groups providing consultation. But it is a paper written by a committee through and through. A basic skill is defined as the ability to use the skill in question in common and straightforward cases. An advanced skill is defined as the ability to use the skill effectively in more complex cases. But I doubt that the very people who most often need what an ethics service can provide will be much affected by it.