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The SoftBank SELECTION USB Type-C Fast Charging AC Adapter supports Qualcomm Quick Charge 3.0 technology over USB Type-C, but let's see if it can be used to charge the Google Pixel phone which supports USB Power Delivery rather than Quick Charge 3.0 for rapid charging. Note we use the Granite River Labs GRL-USB-PD-A1 app to observe charging as below.

The SoftBank charger can supply 15 watts (5 volts @ 3 amps), 18 watts (9 volts @ 2 amps), and 18 watts (12 volts @ 1.5 amps) of charging through its USB Type-C cable connector. When we first connect the Google Pixel with the SoftBank charger, starting with a fully depleted battery the phone starts charging at around 5 watts (5 volts @ 1 amps) at power off. Later we can see the phone draws a higher current of ~3 amps to eventually charge at about 14.4 watts (4.88 volts @ 2.96 amps) with the SoftBank SELECTION USB Type-C Fast Charging AC Adapter.   

The Google Pixel is able to pull power at 14.4 watts which appears to charge well with the SoftBank charger despite the phone using USB Power Delivery and the SoftBank charger uses Qualcomm Quick Charge 3 for fast charging. By comparison, we have also observed a significantly lower power that the phone actually received from its own USB Power Delivery based charger here.