What does like Galathea-Pygmallion mean?

Some Sources of Supply are ideal (from the narcissist's point of view): sufficiently intelligent, sufficiently gullible, submissive, reasonably (but not overly) inferior to the narcissist, in possession of a good memory (with which to regulate the flow of Narcissistic Supply), available but not imposing, not explicitly or overtly manipulative, interchangeable (not indispensable), not demanding (a fatalist to a degree), attractive (if the narcissist is somatic).