[Edit by Hipmonlee] - moved to RoA from http://www.smogon.com/forums/showthread.php?t=3467896 I don't see how stoss is better than reflect to be honest. Reflectzam can beat golem/rhydon, tauros, zapdos, any lax set without amnesia and probably any other physical attacker except maybe persian 1v1 when already paralysed. Stzam can't really afford to be parad first against a lot of those pokemon. Ok stoss can beat parad zams and slowbros, but that's a lot less useful than the reflect list. Reflectzam can basically control the mid-game if it's willing to accept paralysis. Once it's parad and sets reflect up on a special, it controls the battle because it can either try paralyse something like starmie on the switch after spc dropping chansey, or it can set up an offensive physical switch in on chansey. The latter becomes much safer if you've already managed to para starmie. Things like restlax aren't scared by stoss at all. It can come in on stoss (or even twave) and simply rest off the eventual twave later if zam decides it wants to eat a bslam. Rest on lax is common enough to be considered when making standard sets. Stzam is more likely to be in hbeam range when the physical comes in, not only because it's lacking the defence boost, but because the physical now has another move it can switch in on apart from recover. Then there's also the problem that stzam basically needs to predict correctly the when the physical is coming in, otherwise stoss is completely outclassed by reflect. All you have to do with reflect up is keep zam's hp high. Reflectzam can afford to mispredict a lot more than stzam. It's much better to mispredict against a special than a physical, because specials are much easier to switch in against.