After you complete the three dojo challenges on the Isle of Armor in Pokémon Sword and Shield, dojo master Mustard will reward you with Kubfu.
The tiny bear Pokémon, Kubfu, is the star of Pokémon Sword and Shield’s Isle of Armor expansion.
To get Kubfu, you’ll need the Pokémon Sword and Shield expansion pass. After getting the Armor Pass in-game, you’ll have to complete the three challenges that the dojo master, Mustard, gives you. After hunting down the fast Slowpokes, finding Max Mushrooms, and taking down either Klara or Avery (depending on your game version), Mustard will reward you with Kubfu.
