need to sync my gen 4 ipad with my ipad pro I do not have a computer to use to sync my ipads thru itunes.

Physical sync-ing between iDevices, via WiFi, has never been possible.

If you have NO computer with iTunes, your ONLY other option is to use iCloud and/or remote, offsite, “cloud” data storage services like DropBox, BOX, Google Drive and similar services.

Good Luck to You!

What is it that you need to sync? Most data (e.g., contacts, Notes, Reminders, Calendars, files, etc) can be synced via iCloud using the options in Settings > [username] > iCloud.