Battle Tree/Challenges/Multi Battle partners

In the Multi Battle and Super Multi Battle challenges, the player can choose to partner with a friend or with the AI. Unlike the Battle Maison from previous generations, there is only one default AI partner, Rada. To increase the number of AI partners available, the player must Scout opponents after defeating them in Single or Double Battles. Scouting a Trainer costs 10 BP, and this will add the Trainer to the list of potential AI partners. Battle Legends cannot be scouted, but the other special Trainers can be.

As a Multi Battle partner, the scouted Trainer uses the two Pokémon that were at the start of their party when they were scouted, retaining the same Abilities that they had in that battle. However, these Pokémon will become male unless their species cannot be male. If a Trainer who has already been scouted is scouted again, their new party overwrites their previously scouted party.

In only, the player can also recruit Lillie as a partner for Multi Battles by speaking to her at Professor Kukui's laboratory at  after finishing Episode RR. She uses a Fairy-based support set.