Momonosuke has the ability to communicate with the giant elephant Zunisha, being capable of seeing through its eyes and giving it orders, which is the only way it can do anything but walk.
Should Momonosuke order it to attack, he is in command of a powerful weapon capable of wiping out fleets in a single blow. Like his father, Momonosuke also has the ability to hear the “Voice of All Things”.
Momonosuke ate Vegapunk’s man-made Zoan-type Devil Fruit that was considered a failure.
It transformed him into a serpentine dragon which allows him to seemingly fly, when in actuality he somehow produced clouds that he was able to grab onto and climbed up that way.
However, as he has only eaten this fruit recently, he does not seem to have much control over it yet, and in fact transformed unwillingly into his full animal form shortly after consuming the fruit. He did not know that he could produce and climb clouds, as he told Luffy he was stuck in the garbage dump when they met there.
When he was frightened by a hunger-induced hallucination, he unconsciously used his cloud ability to escape with Luffy clinging to him.
He also did not know he could switch forms until Luffy told him. It is also possible, though, that he has no conscious control over his power because the fruit was artificial and a failure. He showed the ability to revert back to his human form when he reunited with Kin’emon. However, Momonosuke is shown to switch forms from time to time.