The Pentatonic b6 is derived from the 5-6-7-9-(b)10 scale steps of the Melodic Minor Scale (i.e. C Pentatonic b6 = C-D-E-G-Ab, is derived from F Melodic Minor). It can be used, in theory, in any situation which utilizes Melodic Minor Scale harmony. It contains a tritone which means can be used as any dominant chord containing that same tritone.
It's sound might take a bit of getting used to. Four of it's notes are from the whole tone scale, as well as the augmented triad, plus the minor second, giving it an added pinch of dissonance.
But this ugly duckling is truly beauty-ful!!
Have Fun! Gotta run!