The Pixel Launcher comes with Google Pixel and Pixel XL last year. Since than developers make a Pixel Launcher but it only runs on Rooted devices. But now third party Developers make an Pixel launcher Apk which can be installed on unrooted Android Phones.
The New APK is based on AOSP’s Launcher 3 and which can be installed to any Android phone. Earlier it was exclusive to only Google Pixel phones before Pixel devices, Google uses Google Now launcher in Nexus devices.
To use Google Pixel Launcher on your phone, you have to download the APK from the source link below. Note: as this is developed by a third party developer, So install it on your own risk.
Download it from : Github