What is the harmonic minor of D flat major?

To make the Eb scale minor you would add 3 flats. Thus the Eb minor scale would have the flats of B,E,A,D,G and C. The last three flats, the Db, Gb, and the Cb, are the minor notes. If your Eb scale is already minor with only two flats, then the minors are Bb, Eb, and Ab.