Lv.69.
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Lv.69.
No because hammer arm is a 4th generation move it didn't exist in emerald or any Pokemon game before it.
Metagross learns Hammer Arm on level 45.
i don't think he can learn it leveling up you can breed a pokemon with hammer arm and boy or girl emboar
Ursaring learns Hammer Arm at level 67 in Pokemon X, Y, Omega Ruby, and Alpha Sapphire.