The theme of the Clean Air Club seems to be the shared emphasis on air and gases, hence the abundance of Air Meteos on all three of them. They serve as the top grouping for the three groupings in the fifth section of Star Trip's Multi mode. The mission of this grouping is to "Launch 75 Meteos at once!" Successfully completing this task allows the player to choose to go to the Rare Cultures if the mission is completed successfully, or the player may choose to go to (or is forced to if the mission is failed) the Illusionists.
Molten Hellions | Chlorophylls
Stray Planet | Mechatropoloids | Earth Lovers
Bubblies | Dimensionals
Electric Nymphs | Hot & Chillies | Clean Air Club
Twin Moons | Illusionists | Rare Cultures
Meteo | Hevendor Realm