He could also curse from the beginning, take the one attack, and since he is faster, go straight into DB. It would take more turns for the sandstorm to kill Gengar than the curse to kill ttar, and if it gets close, he could always pop off a focus blast at the last second. Really bad draw for Ttar, he wins some, just not 50%. Gengar doing Curse right off the bat is only worse than him doing DB first! Why would you ever lower your HP against something like Tyranitar? Then to lower your HP AND take a free hit? Let him take that one attack, whatever it is it will put him below 50% then Curse eats the rest, what a good move. Do Curse first and Tyranitar can still knock him out with a single Rock Slide/ Auto-Damage Sandstorm or Dark Pulse outright, which Blue and he would do because they are both ranged attacks and both of his type. Either is enough to knock out Gengar. The three step (summoned Sandstorm, move, Sandstorm auto damage) scenario of Rock Slide/Dark Pulse then Sandstorm is much more likely then Gengar's Curse, living through any one of Tyranitar's attack, DB, Curse hitting again, Focus Blast,... How ever you want to slice it DB or not I don't see how Gengar get's the win. I can't figure out statements like how Gengar has more versatility to win here. He has a narrow window to do it, Curse is an awful option that is more likely Tyranitar would take it if Gengar's uses that. And without it Gengar has little chance to lower Tyranitar's HP that much before he is KOed himself. DB first leaves him open to attack and two moves would leave him KOed with Sandstorm. The only thing that will keep him in this match is DB but that is circumvented by Sandstorm. The timing is just better for Sandstorm to work around it. Curse is a turn base move that will somehow hit two times and a Focus Blast (which is what is needed to KO here) before One of Tyranitar's moves and Sandtorm that is also turn based? If anything they would hit with the same frequency. So how's that work? Ok if you want to argue that it is not going to work the way I said, then fine call it a draw at the least but even that is cheap. Especially since Yak has said he doesn't like or use DB so it should be removed from the equation.