The easiest way to check SVs on gen 7 is definitely with the Homebrew Application + KeySAV which allows you to check an entire savefile in an instant. You could also make use of the Battle Video exploit which works so long as you have internet access or a second console ( this method, however, is slower and requires more setup to be used ). You can follow this guide on reddit to find the method that best suits your needs.What is the easiest way to check eggs shiny value now if you got a cartridge? I used to extract saves with PowerSaves in X&Y but they are encrypted now, anyone got a workaround?
Alternatively, you could use our SV Checking and Reference thread and I'm sure somebody would be willing to check your ESVs for you if you cannot find a way to do it yourself.