Sorry for yet another haxy battle. Rhyperior has max HP, Draco Meteor would not have OHKOed without the crit, but the final turn of the battle is self explanatory.
Pretty epic finish,
And I mention Tentacruel/Dusknoir in my signature so that if my opponent objects they can tell me not to use them beforehand. And did Tentacruel break the battle? I don't think he did, all he really does is spin, toxic spikes, and soak certain special attacks.