Pokémon Go’s "Precious Pals: Taken Over" event has kicked off, refreshing all the Team Go Rocket encounters and providing some specific rocket-oriented bonuses from Jan. 23-25.
This is the usual Team Go Rocket takeover event, meaning that Giovanni now has a different legendary Pokémon (Thundurus) and the Team Go Rocket leaders have changed their line-ups. The expected bonuses are also live: Team Go Rocket members appear more often and you can forget the move Frustration by using Charged TMs. Additionally, shadow Pokémon caught from one- and three-star raids will have a bigger variety of potential stats.
Note that this event is running alongside the regular "Precious Pals" event, so all the perks from that event are still ongoing. You can see the specific "Precious Pals: Taken Over" perks below, including the Collection Challenge.
Rewards: 1,500 XP, 500 Stardust, Nidoran-F encounter
Rewards: 2,000 XP, 1,000 Stardust, Nidoran-M encounter
Rewards: 2,500 XP, 1,500 Stardust, 1 Super Rocket Radar
Rewards: 3,000 XP, 2,000 Stardust, Vulpix encounter
After defeating Giovanni in battle, you’ll get the opportunity to catch shadow Thundurus.
Rewards: 6,000 XP, 5,000 Stardust, 3 Charged TMs
There's one Collection Challenge active during this event that requires the following:
Rewards: 6,000 XP, 6,000 Stardust, 1 Rocket Radar
Spinning a PokéStop during the event period may yield one of these tasks:

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