Capabilities/moodle/grade:viewall
From MoodleDocs
Template:Moodle 1.9* This allows a user to view all grades of all users including hidden grades (in a particular context). It can be also used at user context.
Template:Moodle 1.9* This allows a user to view all grades of all users including hidden grades (in a particular context). It can be also used at user context.