If you breed your female Vulpix with a Ditto, the Vulpix will be considered the "father" (Ditto always takes the mother role) and will be able to pass down egg moves. Do that till you get a male Vulpix, and breed your Quilava with a Ditto until you get a female. THEN, after all that, breed your female Cyndaquil with your male Vulpix, and you will get a Cyndaquil that knows Extrasensory.
Welcome to the world of Chain Breeding. -___^