We have a map for our first responders that uses a mobile geodatabase (.geodatabase) file. In ArcMap, you could Share As... ArcGIS Runtime Content and get an item in the geodatabase that maintained the symbology of the layer, when added to the runtime application.
In ArcGIS Pro, I'm using arcpy.management.CreateMobileGDB and then arcpy.conversion.ExportFeatures. How can I get the symbology into the mobile geodatabase so the runtime can display it? When I look at the .geodatabase file in Pro that was created in ArcMap I don't see how/where any symbology is stored, but it must be there because the runtime displays it.