Purpose: The aim was to identify the competencies professionals need to promote co-creation engagement within communities. Design/methodology/approach: Co-creation could contribute to building community capacity to promote health. Professional development is key to support co-creative practices. Participants were professionals in a position to promote co-creation processes in health-promoting welfare settings across Denmark, Portugal, France and United Kingdom. An overarching unstructured topic guide was used within interviews, focus groups, questionnaires and creative activities. Findings: The need to develop competencies to promote co-creation was high across all countries. Creating a common understanding of co-creation and the processes involved to increase inclusivity, engagement and shared understanding was also necessary. Competencies included: How to run co-creation from the beginning of the process right through to evaluation, using feedback and communication throughout using an open action-oriented approach; initiating a perspective change and committing to the transformation of co-creation into a real-life process. Practical implications: Overall, learning about underlying principles, process initiation, implementation and facilitation of co-creation were areas identified to be included within a co-creation training programme. This can be applied through the framework of enabling change, advocating for co-creative processes, mediating through partnership, communication, leadership, assessment, planning, implementation, evaluation and research, ethical values and knowledge of co-creative processes. Originality/value: This study provides novel findings on the competencies needed for health promoting professionals to embed co-creative processes within their practice, and the key concerns that professionals with a position to mediate co-creation have in transferring the abstract term of co-creation into a real-world practice.