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The gym is also a restaurant owned by the gym leader, a pastry chef. In order to battle the leader, you must first (at the behest of the head waiter) help wait tables to alleviate the lunch rush. The customers, while waiting, have gotten antsy and may challenge you to a battle while you're serving. So you must deliver certain dishes to certain tables while avoiding (or not) the eyes of impatient trainers. Deliver three dishes and the restaurant will clear out enough for the head chef to come out for a battle.