4× Stardust from win rewards. (This does not include end-of-set rewards.)
The maximum number of sets you can play per day will increase from five to 20—for a total of 100 battles—from 12:00 a.m. to 11:59 p.m. local time.
Pokémon encountered via GO Battle League rewards will have a wider variance of Attack, Defense, and HP.
You can use a Charged TM to help a Shadow Pokémon forget the Charged Attack Frustration.