Here, Niantic describes the Special Research through which Kubfu can be obtained:
"Might and Mastery Special Research" Meet your partner of powerful potential, Kubfu! A new Special Research story is coming! Throughout Pokémon GO: Might and Mastery, you'll be able to reach new heights with your Legendary partner Pokémon You can claim this Special Research at[...]
Might and Mastery Archives
A new Max Battle Weekend event in Pokémon GO will focus on the Legendary Beast, Raikou. Let's take a look at what this event will offer.
Might and Mastery will begin on March 3rd Along with details for the March events, Niantic's announcement also teased the release of Nickit, Thievul, the Dynamax Legendary Beasts, Gigantamax Machamp, and Kubfu Let's get into the details of the upcoming content.
Might and Mastery event graphic in Pokémon GO Credit: Niantic
These are the Pokémon that will[...]