Google recommends charging the Pixel 6 and Pixel 6 Pro with its 30 W USB Type-C charger, a separate purchase on top of its new smartphones. However, the company has now confirmed that neither device ever reaches the charger's limits and only recharge as fast as they do wirelessly.
https://www.notebookcheck.net/Google-confirms-Pixel-6-and-Pixel-6-Pro-wired-charging-wattages.580405.0.html