Azumarill @ Sitrus Berry
Huge Power
252 Atk and HP, 4 Spd
Adamant
-Belly Drum
-Aqua Jet
-Play Rough
-Waterfall
Belly Drum turn 1, Tyranitar fails to OHKO, sand fails to finish it, Aqua Jet OHKOs. At the most, Tyranitar can leave it with 1 HP after the sand.