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I have reason to believe you hack. My fully EV trained Tyranitar could kill you JOLTEON in one hit. Please explain yourself. ALSO, your snorlax should have taken more than 1 turn to wake up.
Well, if TTar used Earthquake, then it's without a doubt an OHKO. But any other move, I'm not too sure. Probably would be an OHKO.
But was Snorlax asleep by Rest, or did you put it to sleep? If you put it to sleep, then you could have gotten unlucky, because I've had times where the Pokemon woke up the turn Hypnosis was used. Those times truly suck. XD Especially if you've made a switch.