Sierra is one of the Team GO Rocket Leaders you can battle on Pokémon Go after collecting mysterious components.
Sierra's first Pokémon: Beldum
Sierra's first Pokémon is always Beldum. Here are the best Pokémon to defeat him easily:
Sierra's 2nd Pokémon
Sierra's second Pokémon is randomly chosen from Exeggutor, Lapras or Sharpedo. Here are the best Pokémon to easily beat each of them:
To defeat Exeggutor
To defeat Lapras
To defeat Sharpedo
Sierra's 3rd Pokémon
The last Pokémon of Sierra is chosen randomly between Houndoom, Shiftry and Alakazam. Here are the best Pokémon to easily beat each of them:
To defeat Houndoom
To defeat Shiftry
To defeat Alakazam
The reward for fighting Sierra is Shadow Beldom and it can be shiny.