Battle parties are groups of three or six Pokémon you can quickly select for Gym, Raid, or Trainer Battles. To create a battle party with an account lower than level 10:
button.
button.To create a battle party with an account level 10 or above:
button. Once you have selected your battle parties, join a battle to use them. You can select an eligible battle party by swiping left over the recommended or previously used battle party.
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Pokémon GO Game GUIDE