You'll face Drayden in Black and he'll use three dangerous Dragon-types. Fraxure will try and warm up with Dragon Dance, so immediately hit it with Ice-type moves before it can boost up. Druddigon is extremely dangerous, as it'll wipe out many of your Pokemon with Revenge. Wear it down with moves like Leech Seed and hit it with paralysis-inducing moves like Thunder Wave for good measure before taking it out. Use the same strategy with Haxorus, because it's incredibly fast and paralysis will give you a fighting chance. Bring in at least two Ice-types for this fight.