You can access the WADLs by using the below API:
https://api.apigee.com/v1/consoles/console_name/apidescription?format=wadl
For example if the Console's Url is https://apigee.com/console/twitter, then console_name
= twitter.
The response of the API is the WADL itself. You can copy the contents of the respone into a .xml file and use it.
Hope this helps!