Yeah, hax is great when it actually works for you. Glad you had little trouble with Whitney, and good luck with Morty. You've really trained them hard, I doubt Morty will give you much trouble, especially with Golbat's Bite and Haunter's Shadow Punch. Hell, they're all Poison-types, so Venonat's Psybeam is bound to be good.
Also, I believe the Shadow Claw TM is near the west entrance to Mt. Mortar, and if I'm not mistaken, Nidorino can learn it...