Pardon my noobness, I'm a lurker not a poster.
Just letting you guys know that Shuckle can learn this at the Move Reminder.
This is great, but Shuckle is still only in the Bug group so it doesn't expand the possible breeding options unless something in Smeargle's group somehow learns it. It's also at least reassuring that this isn't a spider-only move.
Current web status:
Confirmed: Ariados and Shuckle
Extremely likely but unconfirmed: Galvantula
Deconfirmed by breeding: Dwebble, Shelmet, Paras, Venipede, Pineco, Skorupi, Sewaddle
Deconfirmed by level-up: Scatterbug, Weedle, Caterpie, Wurmple
Untested: Venomoth, Pinsir, Ledian, Yanmega, Gliscor, Heracross, Masquerain, Ninjask/Shedinja, Volbeat, Illumise, Flygon, Drapion, Escavalier, Durant, Volcarona, anything that might get it by level-up.
edit: Sewaddle doesn't get it from breeding and Swadloon doesn't get it from move rememberer, but I haven't tested Leavanny.