Final answer:
Aang found Momo at the Southern Air Temple in the animated series Avatar: The Last Airbender.
Step-by-step explanation:
Aang found Momo at the Southern Air Temple. In the animated series Avatar: The Last Airbender, Aang discovers Momo, a flying lemur, during his visit to the temple which is also Aang's former home. Momo becomes a companion to Aang and his friends on their journey, adding an element of humor and light-heartedness to the group.
The Southern Air Temple is one of the key locations in the series and holds significant emotional value to the character of Aang as it represents his past and the destruction caused by the Fire Nation.