Kyurem, Black Kyurem and White Kyurem, are powerful raid targets in Pokémon Go, and you’ll need to take on quite a few of their raids if you want one of these creatures for yourself.

for whichever side you pick out of Black Version for Black Kyurem or White Version for White Kyurem. The quest unlocks at the start of the event, and as long as you start it during the event hours ...