Guidance for authors:
"All manuscripts reporting original research must include a data availability statement. [...]"
Editorial and publishing policies:
"Sharing data sets: A condition of publication in Scientific Reports is that authors are required to make materials, data and associated protocols promptly available to others without preconditions. Data sets must be made freely available to readers from the date of publication, and must be provided to Editorial Board Members and peer-reviewers at submission, for the purposes of evaluating the manuscript.[...]"
You can find an overview of other journal policies at forschungsdaten.org (German only).