Tyranitar is a terrible Reuniclus check imho. The Trick room set slaughters it and it cant even OHKO without a CB. lol Sp.Def Scizor and Sp.Def Jirachi are the best checks.
However CM/Psyshock/Scald/Slack Off Slowbro beats the CMer 1 vs 1 hence why i suggested it. Psyshock hits its defense whilst yours is superior so you win.