I agree with most of these things, but the changes to Necrozma make it a whole new set, wich isn't what I wanted but I still appreciate the feedback. Only thing I can say is, well, you aren't guaranteed that you OHKO Registeel with Fire Blast. First of all, Fire Blast has a 15% chance to miss. Secondly, the calcs prove that you most of the time OHKO him, but not Always.
+2 252 SpA Salazzle Fire Blast vs. 252 HP / 252+ SpD Registeel: 348-410 (95.6 - 112.6%) -- 68.8% chance to OHKO after Leftovers recovery