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The cool thing about USB Power Delivery support with the Apple iPad Pro is that you can use other non-Apple chargers that support USB Power Delivery technology.  

The Apple iPad Pro normally uses 29 watts (14.8 volts @ 2 amps) to get the fastest charging from Power Delivery charges like the Apple 29W USB-C Power Adapter as shown in this review but it still also supports slower 5 volts based charging.

Here we tried charging the Apple iPad Pro with the dodocool 30W USB Type-C PD Charger connected with the Apple USB-C to Lightning Cable.

Using Granite River Labs USB Power Delivery test software, we can see that the dodocool 30W USB Type-C PD Charger supports 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), and 30 watts (20 volts @ 1.5 amps) power profiles.

Unfortunately, the Apple iPad Pro only requests 5 volts @ 2.4 amps and doesn't take advantage of the 15 volts @ 2 amps available from the dodocool 30W USB Type-C PD Charger.

Here we can see the dodocool 30W USB Type-C PD Charger providing power to the Apple iPad Pro with the voltage eventually getting to 5.2 volts and current reaching 1.9 amps.