Mustard explained that the battles would take place on his battlefield outback and that it was a Power Spot, so Dynamaxing would be possible. Mustard said each trainer could bring three Pokémon, however you can only use one per fight except in the finals where you can use two. He also said that in an hour he would announce the layout for the fights.
(Liam, Shiranui, Chuck, Klara, and Avery. Am I missing someone who gathered the max mushrooms?)