Pokémon Legends: Z-A – Mable’s Research Center Guide: Rewards, Requests & Requirements
via screenrant.com
Short excerpt below. Read at the original source.
One of the primary ways you’ll grow stronger as a Trainer in Pokémon Legends: Z-A is by leveling up at the Pokémon Research Center. This Lumiose City institution grants you rewards for completing various requests, almost always related to filling out your Pokédex by catching various species of Pokémon.