Thought I'd bring this discussion here.
What exactly are people running as far as nature / EVs / 3rd slot goes for Work Up MixKen? The possibilities are easily adaptable based on what you need to cover and what moves you run, but I assume its something like this:
Blaziken@Life Orb
Rash; 96 Atk / 196 SpA / 216 Spe
Work Up
Fire Blast
Hi Jump Kick
HP Ice / HP Electric / Stone Edge
Enough attack to OHKO Max/Max Bold variants of Blissey and Eviolite Chansey before a boost, and significant power otherwise. +1 HJK OHKOs Garchomp while +1 HP Ice OHKOs Latios (rocks).
+1 HP Electric OHKOs Slowbro with Stealth Rock, and 2HKOs Max/Min Bold Jellicent, so it's all up to preference. I'm assuming you could just as easily run a +Atk nature and use Stone Edge in the last slot, saving Fire Blast for physical walls like Hippowdon and Gliscor (something like Naughty 116 Atk / 176 SpA / 216 Spe OHKOs them both with Fire Blast at +1).