Sierra is one of three Team GO Rocket Leaders that Trainers can encounter and battle with a Rocket Radar in , alongside Cliff and Arlo. These three boss fights are very difficult if you don't come prepared, so if you're taking on Sierra, it's important to know her current lineup, their weaknesses, and the best counters to beat them all.
As part of the Adventure Week: Taken Over event in August 2024, the lineups of Team GO Rocket members have been shaken up. Sierra is no exception, with some powerful Shadow Pokémon like Carvanha, Ampharos, and Houndoom having the potential to appear on her team. As long as you take the best team possible into battle, though, you should be able to emerge a winner.
Sierra will always send the Dark/Water-type Carvanha into battle first, which makes this a fairly easy stage to prepare for. However, her second and third Pokémon can be one of three different options, so planning ahead for these will be a little more difficult. What you can do, though, is put together a strong team that has as much coverage as possible for the best shot at success.
You can see Sierra's full potential lineup (thanks to LeekDuck for the help with this information), their weaknesses, and the best counters to defeat them in the table below:
Wave
Pokémon
Weaknesses
Best Counters
1
Carvanha
2
Ampharos
Milotic
Sableye
3
Alakazam
Houndoom
Nidoqueen
Remember, Sierra will only send out one Pokémon from each wave. These will be chosen at random, but once you've started a battle with her at a specific PokéStop or Rocket Balloon, her team will remain the same when you rematch her. Think of your first battle as a reconnaissance mission where your main goal isn't to defeat her, but to figure out which Pokémon she's using. This will help you put the right team together.
One of the best teams you can use to beat Sierra in Pokémon GO right now is Gardevoir, Mamoswine, and Electivire. There's no such thing as a perfect team, as that will always depend on
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