Apple has released the sixth beta of watchOS 6 to the developers
The watchOS 6 SDK provides support for developing watchOS apps for Apple Watch devices running watchOS 6. The SDK comes bundled with Xcode 11 beta available from Beta Software Downloads. For information on the compatibility requirements for Xcode 11, see Xcode 11 Beta 5 Release Notes.watchOS 6 Beta 6 released
Warning
You must update your watch to watchOS 6 beta 2 or later before updating to iOS 13 beta 6 otherwise your watch will no longer be able to connect to your phone. (52854192)