Google Play Services 13.2.78 Ultima Version Guide

For a wide range of Android devices running and Android 6.0 (Marshmallow) , version 13.2.78 is considered that final stable milestone . Later versions (14.x, 15.x, and above) require more modern libraries (such as a newer version of the Android Support Library or higher API level requirements) or are optimized for 64-bit processors, leaving older 32-bit ARMv7 devices behind.

If you see "13.2.78 ultima version" referenced online, it likely means: google play services 13.2.78 ultima version