The first Double Battle in Pokémon canon took place at the Kumquat Gym. In order to gain the Gym's Badge, challengers must use two of their Pokémon to defeat two of Luana's Pokémon simultaneously. The Kumquat Gym itself also doubles as Luana's luxury hotel, and battles are held in and around the resort. The hotel is several stories tall and has a built in battle arena, an artificial hot spring, a tennis court, and exercise rooms for use for both Pokémon and people.
Pokémon used in Gym
One of Luana's Pokémon, Alakazam is a strong Pokémon that has learned to battle with teamwork alongside Marowak. Having powerful Psychic attacks, it is capable of immobilizing Pokémon. Using a powerful Hyper Beam attack, it can severely damage an opponent. However after being knocked over, the Hyper Beam was its own demise in Luana's battle with Ash.
Together with Alakazam, it knows Bonemerang. After being attacked by Charizard's Seismic Toss, it was not fazed. When Hyper Beam tore across the battlefield and hit Marowak, knocking both of Luana's Pokémon out, it gave Ash the victory of the match.