Team Rocket balloons spawned everywhere Pokémon Goe must defeat them to complete the new battle challenge. Battle Challenges will run from July 10-15, and as Team Rocket members must be battled to progress through the challenge, the timers for these spawns have increased. You can expect to fight other Team Rocket grunts, leaders, and even Giovanni if you have a Super Rocket Radar.
Traditionally, Team Rocket balloons appear to players every six hours. These rotate from 12 to 6, then from 6 to 12 in the local time zone. When a Team Rocket balloon appears, it will be shown above you in the game. It will probably help you move away from your character to see him better. When you see him, click on the balloon and you will have the chance to fight a Team Rocket, one of the leaders, Sierra, Cliff or Arlo, the Team Rocket boss Giovanni and his Suicune. Leaders are available if you are equipped with a missile radar and Giovanni is possible if you are a Super Rocket radar.
Spawns have increased dramatically to make it easier for trainers to encounter these balloons for battle challenges. From July 10-15, you can expect to see balloons appear at three-hour intervals. It is split from 12 to 3, 3 to 6, 6 to 9 and 9 to 12. For those eager to battle Team Rocket, make sure you have your Pokémon Go app open during these time frames to get a chance to fight them. There will also be a Team Rocket invasion taking place on July 12 from 11am to 14pm in your local time zone, greatly increasing the chances of the balloons showing up. Also, any of these balloons can be a Meowth, which contains Jessie and James, which you can fight.
Team Rocket balloon spawn times will likely return to their six-hour range after Battle Challenges end on July 15th.