Start Time : Monday, February 24, 2020, at 1:00PM PST
End Time : Monday, March 9, 2020, at 1:00PM PST

For the preseason, the GO Battle League will begin with the Great League, then move on to the Ultra League and the Master League. Leagues will rotate every two weeks. You can still rank during preseason, but your rank will be partially reset at the beginning of Season 1. You will still earn rewards for battling and winning, so this is a great time to practice and earn some cool rewards as well.

The Master League will follow on Monday, February 24, 2020, at 1:00 p.m. PST, with the Great League returning once again on Monday, March 9, 2020, at 1:00 p.m. PST. Stay tuned for more details on when the preseason will end and Season 1 will begin.

Bonus

Stardust
Rare Candy
TMs
Encounter Pokémon