During the Main Story, Mario and Cappy will have to find Power Moons in order to power up the Odyssey to travel from kingdom to kingdom. After the Main Story is completed, Mario can find and obtain additional Power Moons in order to unlock new Kingdoms and Costumes. In Cloud Kingdom, there are 2 Power Moons that Mario can find during the Main Story. Some of these Power Moons will not be able to be found and obtained when first entering the kingdom; some Power Moons can only be obtained (even if listed below) after the main objectives have been completed in Cloud Kingdom. (Even more will appear after the Main Story is completed.)
Cloud Kingdom Power Moons & Mission Titles (Main Story)
Cloud Kingdom Power Moon 01 - Picture Match: Basically a Goomba
Cloud Kingdom Power Moon 02 - Peach in the Cloud Kingdom
Additionally, there will be 7 Post Game Power Moons that can be found and obtained in Cloud Kingdom.