Phonegap no longer supports the cordova plugins that we used to create native apps.
This includes all public plugins AND Cordova / PhoneGap core plugins.
Are there other options to generate native apps, or is there a solution to change the config.xml and add private plugins to phonegap?
Correct cho! It`s just a matter switching over to NPM, most plugins are there.
If you are storing your mobile project with GIT I would suggest checking in the plugins to your repository as well just in case.