Team GO Rocket Leaders
After battling a Team GO Rocket member, you will receive a special item called a mysterious component. Collect six mysterious components to create a Rocket Radar. You can also purchase a Rocket Radar from the in-game shop for 200 Gold Coins.
The Rocket Radar is a special item that can be used to scan the immediate area for PokeStops taken over by Team GO Rocket. Simply tap the Rocket Radar at the top-right corner of the screen to perform a scan.
The Rocket Radar is also required in order to encounter Team GO Rocket Leaders at PokeStops or in Rocket hot-air balloons. Losing a battle with a Team GO Rocket Leader will allow you to keep the Rocket Radar, but defeating the GO Rocket Leader will use your Rocket Radar.
All Team GO Rocket Leaders have three Pokemon in their teams. Their Pokemon teams will change over time, and their CP is set to your level. Defeat a Team GO Rocket Leader to capture one of the Shadow Pokemon they used in battle.
Arlo
Arlo is one of the Team GO Rocket Leaders. He often uses Dragon-type Pokemon. Bagon and Salamence are often found in his team.
Cliff
Cliff is one of the Team GO Rocket Leaders. He often uses Rock- and Ground-type Pokemon. Tyranitar might be found in his team.
Sierra
Sierra is one of the Team GO Rocket Leaders. She often uses water-, psychic-, and dark-type Pokemon. Alakazam, Exeggutor, Shiftry, Houndoom, or Lapras might be found in her team.
Giovanni
During special events, you will be able to get a Super Rocket Radar. This item is used to find the Team GO Rocket Boss: Giovanni. As the Boss of the thieving Team GO Rocket, Giovanni often has a special event legendary Pokemon in his team. The first Pokemon in his team is almost always the normal-type Persian. Other Pokemon that rotate through his team include Rhyperior, Gyarados, and Honchkrow.