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As ShinyManafi said, OHKO moves are generally bad. They miss most of the time, and with such low PP they just aren't worth the effort. I would use Ice Beam instead of Sheer Cold.
If you really want to use One Hit KO moves, there are two ways to go about it:
Articuno with Mind Reader and Sheer Cold. It learns both of these by levelling up.
Smeargle: Sketch either Mind Reader or Lock On, and sketch one of the KO moves.
But I strongly recommend against it. Why not just use regular attacking moves?