God Dammit! I managed to get myself a lot of free time and was playing Multi like crazy, only to lose at battle 63 (equaling my personal best in Multi) to an Ace Trainer and a Breeder that somehow managed to pull out Choice Band Aerodactyl + Chople Berry Tyranitar as leads. Seriously, Aerodactyl is the reason why Choice Scarf is so awesome on Heatran, and yet the one time I face it as a lead it can't be killed with Flash Cannon because it just happened to be in Sandstorm. Of course! It is especially painful given that it is less likely to happen in Multi than it is in Doubles (because you very rarely have to face two trainers of the same type whereas Hikers have the possibility of using them together in Doubles). Azumarill nearly pulled through but couldn't beat the back-ups on its own (Azumarill is awesome but, like Scizor, it can sometimes have trouble in Double and Multi battles if it is left to fight on its own).
Still, my experiences in Multi has shown to me that dual Choice Scarf leads work really well in Multi. I might do some more testing with different leads. Heatran and Abomasnow work very well but it's just too slow with hail damage going on and losses are all the more fustrating for it, so maybe I can think of something faster.