Copying iOS autocorrect custom dictionary among devices
Do you actually want an autocorrect for a misspelling or a keyboard shortcut for an abbreviation?

If you sync the iPads with the same computer they should have all the same keyboard shortcuts. i.e. "omw" becomes "On my way!" (without the quotes).

That shortcut I created on my iPhone but I am typing now on my Mac Pro and it expanded to the full phrase as I typed it.

I use this one all the time "mcx" becomes "Mac OSX".

Look at the "System Preferences > Keyboard > Text" tab for shortcuts on your computer. If you create them on the desktop computer they should sync to your iOS device(s) and vice versa.

Check this link here if you want to try to copy the actual file:
Where is the text expansion file located with OS X?

Happy Wednesday!