Lvl 55 0 SpA Abomasnow Blizzard vs. Lvl 55 0 HP / 0 SpD Abomasnow: 73-87 (40.3 - 48%) -- guaranteed 3HKO
Possible damage amounts: (73, 73, 75, 76, 76, 78, 78, 79, 79, 81, 82, 82, 84, 84, 85, 87)
Don't forget to change the typing of Rotom-Wash and Rotom-Heat when calcing. They had to be put under regular Rotom stats as there is a bug in Pokemon Platinum where all Rotom-Forms have the stats of base Rotom.