What are the exact requirements to unlock the IV checker NPC at the Battle Tree

pokemon-sun-moon

He says

This Pokémon…has relatively superior…
ya-a-awn
…Who are you?
No one impressive enough to shock me awake.
ya-a-awn

And then refuses to check your Pokémon's IV's.

Best Answer

Hatch 20 eggs using the Day Care, then go talk to the IV Judge at the Battle Tree. From then on, you can press a button in the PC to show a circular line graph that shows you each of your pokemon's IVs. 

    Message     |  IV range
    No Good     |       0
    Decent      |  1 - 15
    Pretty Good | 16 - 25
    Very Good   | 26 - 29
    Fantastic   |      30
    Best        |      31
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