And why both Swords and Belly on Zac-C?
Exchange any of the OHKO Moves with Sheer Cold, iirc, it's better.
And uh remove the second Zac-C.
Change Calyrex-S for some other Cont, it's unreliable 100% because of it's crippling weaknesses. Any Pokémon with a good Attack / Special Attack, and a workable other Phys-Spec Attacking stat that you chose from would work. Like, this statement is confusing, I meant that things like Zekrom, with 150 base Attack, and a workable base 120 SpA, use those things as Cont users. It just depends, I ain't saying use Zekrom.
And, Regieleki is a far better OHKO move user, because of it's blazing speed. Keep Gastro Acid on it also, as Pokémon with Sturdy are immune to OHKO moves, and so Gastro would nullify their Ab, which would mean that Sheer Cold / any other OHKO move would work.