Articuno is the only pokemon that learns both a OHKO move and a Next Move Hits move.
You could also use Smeargle - if you max Spd, you might be able to get in a Spore.
But I wouldn't recommend relying on OHKO moves. Maybe if you EV trained Articuno for HP + defense to take hits...but a well rounded team is better.
You've got Latios, Walrein, Sceptile - I would replace Walrein with an OU tank, and replace Sceptile with a physical sweeper
BTW, if you want an official rate, post the movesets + EVs/nature in the Rating Center.
_________________Need homework help? "Screw the Ivys, I'm applying to Smogon University!"ShiniesRuby:
Spinda, Golbat, DuskullPearl:
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