Originally Posted by Fat Rayland
252 SpA Life Orb Tornadus-T Hurricane vs. 248 HP / 8 SpD Scizor: 270-320 (78.71 - 93.29%) -- 37.5% chance to OHKO after Stealth Rock
252+ Atk Choice Band Technician Scizor Bullet Punch vs. 0 HP / 0 Def Tornadus-T: 195-229 (65.21 - 76.58%) -- 12.5% chance to OHKO after Stealth Rock
252+ Atk Choice Band Technician Scizor Pursuit vs. 0 HP / 0 Def Tornadus-T: 130-153 (43.47 - 51.17%) -- guaranteed 2HKO after Stealth Rock
Go ahead and play chicken if you want. You have a greater chance of losing than Tornadus-T does. Plus you are now locked into Pursuit, allowing the opponent to switch into a set-up sweeper.
I'm pretty sure you're just theorymoning like crazy because this analysis is so flawed it's not even funny. Do you have any idea what happens when Tornadus-T sees a Scizor? Usually it's when it's taken a bit of damage, LO or otherwise and it's got a kill with with less than 70% life left. Basically It's never going to voluntarily stay in to take a bullet punch. Hell it's not going to want to stay in even if a pursuit is coming 100% of the time. It's either going to go down to LO or remain with like 10-15% before regen best case making it basically useless if rocks are up.
Your pursuit calculation is wrong btw... because it does more if it switches out.
Basically look. Tornadus-T comes in with rocks... 75% attacks once and gets a kill 65%. Pursuit ohko when if it switches. Bullet punch 1hko if it switches. It attacks (55% health) Pursuit does 50%. you're left with 5% and you kill scizor and die to LO. That's best case. If scizor decides to bullet punch you're dead with scizor at 100%.