The airport is located in the southern half of Southerly City. One NPC remarks that once they finish building the airport in Goldenrod City, people will be able to fly to Johto. After having bought the Mystery Tckt at the Battle Arcade, you may fly to the Mystery Zone from here.
The Battle Building is located in the northern half of Southerly City. Inside, the player is able to participate in a stamina challenge. The player must win 7 consecutive battles. Their pokemon are healed after each battle. The prize for completion is a nugget.
The leader of Southerly City Gym is Leader Ernest, a fire-type specialist. The layout of the gym includes a platform with narrow walkways over a pool of lava. In order to progress, the player must defeat trainers who douse fires so that the player may proceed.