To defeat Sierra in Pokémon GO, you should rely on the right counters in April 2025. We at MeinMMO have looked into which Pokémon Sierra will use in battle and show you the best monsters against this Rocket Boss.
Who is Sierra? Sierra is one of the Team GO Rocket bosses, alongside Arlo and Cliff. You can challenge these bosses with a Rocket Radar. We have summarized the following topics about Sierra in this guide:
- Rocket Boss Sierra – Current Teams
- The best counters to defeat Sierra
- How to find Sierra
- Is fighting Sierra worth it?
Rocket Boss Sierra – Current Team in May 2025
Which Pokémon does Sierra use? Before you face Sierra, you should familiarize yourself with the Pokémon she might use against you in battle. In total, the Rocket Boss can rely on 7 different Pokémon.
| Position | Pokémon |
| First Pokémon | Pionskora |
| Second Pokémon | Vulnona Tentantel Milotic |
| Third Pokémon | Hundemon Nidoqueen Piondragi |
By clicking on our link in the previous table, you will directly see the best counters against the Pokémon set by Sierra.
The best counters to defeat Sierra
Once you have found Sierra, you can start the battle. But which Pokémon should you use against this Rocket Boss? With the help of the overview from Pokebattler and Pokémon GO HUB, we have summarized the best counters for you below.
Defeating Pionskora – Best counters against the 1st Pokémon
This is how you can defeat Pionskora: First, you will encounter the Poison and Bug-type Pokémon Pionskora in the battle against Sierra. You should rely on Fire, Flying, Psychic, and Rock attacks, as it has weaknesses against them.
| Pokémon | Moveset |
| (Crypto-)Mewtwo | Confusion and Psystrike |
| (Crypto-)Garchomp | Fire Fang and Fly |
| (Crypto-)Heatran | Fire Spin and Lava Plume |
| (Crypto-)Rayquaza | Air Slash and Sky Attack |
| Reshiram | Fire Fang and Cross Flame |
| (Crypto-)Staraptor | Air Slash and Fly |
If you want to use a Mega Evolution against Trasla, the following are suitable:
- Mega-Rayquaza with Air Slash and Hurricane
- Mega-Charizard Y with Fire Spin and Blast Burn
- Mega-Alakazam with Confusion and Psychic
- Mega-Kyurem with Confusion and Psychic
Defeating Vulnona, Tentantel, and Milotic – Best counters against the 2nd Pokémon
This is how you can defeat Vulnona: The Fire-type Pokémon is particularly weak against attacks from the types Rock, Ground, and Water.
| Pokémon | Moveset |
| (Crypto-)Kyogre | Waterfall and Hydro Pump |
| (Crypto-)Groudon | Mud Shot and Precipice Blades |
| (Crypto-)Rhydon | Rock Smash and Rock Slide |
| (Crypto-)Garchomp | Mud Shot and Earth Power |
| Landorus (Therian Form) | Mud Shot and Sandstorm |
Alternatively, you can also rely on the following Mega Evolutions:
- Mega-Kyogre with Waterfall and Hydro Pump
- Mega-Groudon with Mud Shot and Precipice Blades
- Mega-Garchomp with Mud Shot and Earth Power
- Mega-Samurott with Water Gun and Waterfall
This is how you can defeat Tentantel: The Grass and Steel-type Pokémon has a simple weakness against Fighting attacks and a double weakness against Fire attacks. So, you should rely on Fire attacks to defeat Tentantel.
| Pokémon | Moveset |
| (Crypto-)Heatran | Fire Spin and Lava Plume |
| (Crypto-)Salazzle | Fire Spin and Overheat |
| (Crypto-)Blaziken | Fire Spin and Blast Burn |
| Reshiram | Fire Fang and Cross Flame |
| (Crypto-)Rayquaza | Fire Spin and Overheat |
For Mega Evolutions, you can rely on the following counters:
- Mega-Blaziken with Fire Spin and Blast Burn
- Mega-Charizard Y with Fire Spin and Blast Burn
- Mega-Charizard X with Fire Spin and Blast Burn
This is how you can defeat Milotic: Milotic is a Water-type monster. For this reason, it is weak against Grass and Electric.
| Pokémon | Moveset |
| Katagami | Leaf Blade and Grass Knot |
| (Crypto-)Raikou | Thunder Shock and Thunderbolt |
| (Crypto-)Magnezone | Spark and Thunderbolt |
| (Crypto-)Electivire | Thunder Shock and Thunderbolt |
| (Crypto-)Tangrowth | Vine Whip and Leaf Tornado |
As Mega Evolutions, the following monsters are suitable against Milotic:
- Mega-Sceptile with Bullet Seed and Leaf Blade
- Mega-Venusaur with Vine Whip and Flora Statue
- Mega-Voltress with Thunder Fang and Thunderbolt
- Mega-Ampharos with Volt Switch and Thunder Cannon
Defeating Hundemon, Nidoqueen, and Piondragi – Best counters against the 3rd Pokémon
As the third and final Pokémon, Sierra will rely on Hundemon, Nidoqueen, or Piondragi. Again, it is random which of the monsters you will encounter.
This is how you can defeat Hundemon: The Dark and Fire-type Pokémon is the evolution of Hunduster. In battle, you should definitely rely on attackers of the types Fighting, Rock, Water, or Ground.
| Pokémon | Moveset |
| Terrakion | Double Kick and Sacred Sword |
| (Crypto-)Tyranitar | Rock Slide and Stone Edge |
| (Crypto-)Groudon | Mud Shot and Precipice Blades |
| (Crypto-)Kyogre | Waterfall and Hydro Pump |
| (Crypto-)Swampert | Mud Shot and Water Cannon |
| (Crypto-)Rhydon | Rock Smash and Rock Throw |
If you want to use a Mega Pokémon against Hundemon, you should rely on the following counters:
- Proto-Groudon with Mud Shot and Precipice Blades
- Proto-Kyogre with Waterfall and Hydro Pump
- Mega-Swampert with Water Gun and Water Cannon
- Mega-Garchomp with Mud Shot and Earth Power
This is how you can defeat Nidoqueen: The Poison and Ground-type Pokémon is part of Sierra’s team and may encounter you in 3rd position. In battle, you should rely on Ground, Ice, Psychic, and Water attacks.
| Pokémon | Moveset |
| (Crypto-)Mewtwo | Psychic Blade and Psystrike |
| (Crypto-)Metagross | Psycho Cut and Psychic |
| (Crypto-)Garchomp | Mud Shot and Earth Power |
| (Crypto-)Groudon | Mud Shot and Precipice Blades |
| (Crypto-)Kyogre | Waterfall and Hydro Pump |
Against Nidoqueen, you can also use the following Mega Evolutions:
- Proto-Kyogre with Waterfall and Hydro Pump
- Proto-Groudon with Mud Shot and Precipice Blades
- Mega-Swampert with Water Gun and Water Cannon
- Mega-Alakazam with Psychic Blade and Psychic
- Mega-Garchomp with Mud Shot and Earth Power
This is how you can defeat Piondragi: Piondragi is a Poison and Dark-type Pokémon from the third generation of games. Due to its type combination, it has only one weakness against Ground-type attacks.
| Pokémon | Moveset |
| (Crypto-)Groudon | Mud Shot and Precipice Blades |
| (Crypto-)Excadrill | Mud-Slap and Sand Tomb |
| (Crypto-)Garchomp | Mud Shot and Earth Power |
| Landorus (Therian Form) | Mud Shot and Sandstorm |
| (Crypto-)Mamoswine | Mud-Slap and Body Slam |
Additionally, you can also rely on the following Mega Evolutions against Piondragi:
- Proto-Groudon with Mud Shot and Precipice Blades
- Mega-Garchomp with Mud Shot and Earth Power
How to find Sierra
To face Sierra, you first need to find her. The Rocket Radar will help you with this. It consists of the 6 mysterious parts that you can obtain by defeating Team GO Rocket Grunts.
Once you have collected all parts, you can assemble them into a Rocket Radar and activate it. Afterwards, a symbol with an “R” will appear on your right game screen. Clicking on it will open a map of your surroundings showing all currently available Rocket bosses. You can then begin your search for Sierra.
Alternatively, Rocket bosses like Sierra spawn in a black Team GO Rocket balloon when a Rocket Radar is activated. You can find them up to 4 times a day in these balloons, similar to the Grunts.
You can see how to find Sierra and the other bosses in the following video:
Can you specifically find Sierra? When searching for Sierra at PokéStops, there is no way to see in advance where she is located. You can only see who is waiting for you at a particular stop when you arrive there. Once you have found Sierra, she will stay at that stop all day. Which boss is in the balloon is also random.
Is fighting Sierra worth it?
Why should you fight Sierra? To be able to fight against the great Team GO Rocket Boss Giovanni, you will receive special research tasks periodically. You need to complete these tasks to obtain a black Super Rocket Radar.
For this, you need to fight against the Rocket bosses Sierra, Arlo, and Cliff. If you defeat them, you will receive the special Rocket Radar and can track Giovanni. However, even without these tasks, you have the opportunity to battle against the Rocket bosses Sierra, Arlo, and Cliff with every completed Rocket Radar. It’s especially worth it because of the rewards. Unfortunately, you cannot fight Giovanni with them.
These are the rewards after a fight against Sierra
Which Crypto Pokémon does Sierra have? Crypto-Pionskora is the current Pokémon that you receive as a reward after defeating Sierra.
Other rewards: Additionally, you will receive some items as a reward. However, one thing is different from the normal Grunts. If you have an empty slot in your Pokémon bag for egg storage, you will also receive a 12 km egg.
These eggs often hide interesting monsters, making collecting and hatching them worthwhile. We have summarized which Pokémon are currently found in 12 km eggs here.
Do you regularly fight against Sierra and the other Rocket bosses? Which counters do you use most often? Or is Team GO Rocket not really your thing? Feel free to share your opinion here on MeinMMO in the comments and exchange ideas with other trainers.
By the way: What is this Shiny Pin anyway? We have looked into what it is all about and show it to you.
