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Clauncher gets Crabhammer as an egg move too. I bred a female Crabhammer Clauncher with a male Clauncher without Crabhammer and the move was still passed on.
Can anyone test:
Simple Beam(Audino->Skitty->Golduck->Clauncher), Bide, Power Split(Shuckle->Surskit->Clauncher). I will add more suggestions when I can think of them.