Sierra

Sierra is one of the three secondary antagonists of Pokémon GO. She is one of the three leaders of Team GO Rocket alongside with Cliff and Arlo. Sierra has slowly overtime worked to become one of Giovanni's most trusted confidant. She grew up on the streets, which allowed her to learn martial arts. Sierra is also behind the Strange Egg Progam. Sierra is mysterious and alluring. While she is Giovanni's most trusted follower, she prefers to seclude herself from people. Spark mentioned while he is not normally intimidated by any Rocket members, he felt small in her presence.