I really like this pokemon design-wise, and to be honest he doesn't look THAT bad seeing as he has a(imo) decent(Albeit predictable) movepool, it gets what it needs, STAB Priority and Rock Polish to get around the mediocre speed stat, good coverage moves in Brick Break(Especially when paired with Dark STAB), Iron Head and Stone Edge. It looks viable in UU. Although its movepool can definitely use some new moves most notably Bullet Punch, Drill Liner/Earthquake, Ice Punch and perhaps some other filler moves to give it more variety in its movepool. Other than what I predict would be its standard consisting of:
Sucker Punch/Night Slash
Brick Break
Stone Edge/Iron Head
Rock Polish/Iron Head
One partner I see that can work great for it is Mismagius, as she is immune to Kirikizan's Fighting and Ground weaknesses, and Kirikizan 4x resists her Dark and Ghost weaknesses, Gengar also works in the higher tiers for the exact same reasons, and Kirikizan is even immune to its Psychic weakness(A rare attacking type, but better than nothing)