Ah, Eric, you must be recalling the Shobijin fairies.  They are associated with Mothra (Mosura in Japanese) and can summon the giant moth through a prayer in song titled "Mosura No Uta", usually played in the original Japanese even if the rest of the movie is a dubbed version.  (Okay, I dug up that from Wikipedia to sound more impressive.)

Unlike Godzilla, Mothra has almost always been depicted as a "protector" of the world (not necessarily people or human civilization).  The only time it seemed destructive was in its debut film because greedy people kidnapped the fairy twins and the giant larval form came searching for them.  Otherwise, it has helped fight off other daikaiju though those allignments have changed from movie to movie.

Sincerely,

Bill

Tempt the Hand of Fate and it'll give you the "finger"!