How To Get The Master Ball In Pokemon Legends: Z-A

"The Master Ball comes from Mable's Research. The NPC herself can be found in the Pokemon Research Center in the southern part of the map. You can't miss it since a main quest takes you there fairly early in the campaign. The Pokemon Legends: Z-A Master Ball can be yours upon reaching Rank 49 in the Mable's Research tab. You don't actually need to revisit Mable every time."

"Hitting level 49 to get the Pokemon Legends: Z-A Master Ball is no small feat, as it's going to take you dozens of hours. That's because the points themselves come from requests/tallies. Here's what you can expect: You need to complete your Pokedex by catching unique species--i.e. one of each type. We've got you covered in our Pokedex/Pokemon locations guide."

"The "Catching X-type" tallies grant points as you capture Pokemon that belong to a particular type/element. A good idea is to buy a lot of cheap Poke Balls so you can catch low-level critters like Pidgey (Normal/Flying) and Budews (Grass/Poison) to fulfill multiple tallies. You also have to unlock dozens of Mega Evolutions. Other objectives and actions, such as resting on benches, winning battles, and smashing Mega Crystals also help boost your rank."

Mable's Research awards the Master Ball at Research Rank 49. The NPC Mable appears in the Pokemon Research Center in the southern region and is reachable through an early main quest. Players can claim leveled rewards from the menu without revisiting Mable. Earning Rank 49 requires dozens of hours because points come from completing requests and tallies. Core tasks include completing the Pokedex, surveying Wild Zones, fulfilling type-based catching tallies, unlocking many Mega Evolutions, and performing actions like resting on benches, winning battles, and smashing Mega Crystals. Link Trades can provide extra points to accelerate progress.

Read at GameSpot