So a little back story first. Jack claims he has a strategy that makes it so he wins every time against any opponent. It involves a Hasty Staraptor that know Quick Attack, Endeavor, Roost, Protect and a focus sash. He survives the fist hit due to focus sash and uses endeavor to bring down opponent to 1 HP then quick attack them to knock them out. Now its a nice plan, but its not foolproof. this is where things go wrong.
http://imgur.com/a/ShneXTo clarify a few things. Haste means nothing in Pokemon or Pixelmon. It is not a move ability nature item or any variation there upon. Hasty is only a nature and does not increase your evasion, nor does it make all moves without 100% accuracy miss. So Extreme Speed will still hit before Quick Attack and will still have a 10% chance of missing. Also Focus sash only prevents OHKO's and will fail if the first attack would not have knocked the Pokemon out initially. Using Roost after that and regaining full health again will not make focus sash work again. A OHKO after roost will be just that, a OHKO.
If I am wrong and this is really a fool proof plan that makes me act the boy then my apologies I quit immediately.