This set: 252+ SpA Choice Specs Chatot Boomburst vs. 252 HP / 252+ SpD Crustle: 147-173 (46.9 - 55.2%) -- 15.6% chance to 2HKO after Leftovers recovery
vs.
Normal: 252+ SpA Choice Specs Chatot Boomburst vs. 0 HP / 0 SpD Crustle: 188-222 (66.9 - 79%) -- guaranteed 2HKO
It's barely a switch-in, but it does OHKO with Rock Blast :p so just good enough
0 SpA Roselia Giga Drain vs. 252 HP / 252+ SpD Crustle: 70-84 (20.3 - 24.4%) -- guaranteed 5HKO
Easy.
and on, i'm too lazy to find more calcs zzz[/calc]