Zarel/Pokemon-Gen-6-Learnsets — pull request #28 by TalkTakesTime (2013-10-27 04:19:14+00:00)
Title: Clauncher and Clawitzer do not get Shell Smash

http://www.smogon.com/forums/threads/clawitzer.3490081/#post-4895386 and following posts
It was originally posted on Serebii that they got it at 42 and 47 respectively, which has since been changed to the correct move; Aqua Jet