In Pokemon S/M, you can have access to an IV reader in the Battle Tree. However, you must hatch 20 eggs to get his attention. When does the hatch-counter start? Does it start after you unlock the Battle Tree or from the beginning of the game?
You unlock the Judge function, which allows you to view the IV's of your Pokémon, once you hatch 20 eggs, starting after you beat the Pokémon league and unlock the Battle Tree