Originally Posted by DaRkUmBrEoN
The reason why an mon using a CH with Atk-1 and BRN on a mon with reflect is different, is cause the new calc actually ignored the -1 att and the reflect, but keeps the burn, as it should do. Thus the new calc is correct. Manual calculations can be off if you didn't know that's the case.
I know that CHs ignore negative stat values of the user and Reflect/Light Screen, but still take into account of Burn.
But both damages are still different on the new and old calcs.