Masterball

The Masterball is a type of Pokéball. It will always catch a wild Pokémon after defeating it if is the highest type of Pokéball active and there is a remaining supply in the Pokéball selector.

Description
The ultimate Pokéball to capture Pokémon with, it has a 100% catch rate. Each time it is purchased it becomes 35% more expensive, increasing to the price cap at 100 times the base price.

Acquisition
Note: The Sinnoh Berry Master in Hearthome City also offers daily trades for Masterballs.
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