Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-4560646-20160531032209

Yossipossi wrote: Wait, if Snowdrake has negitive attack, does it heal you?

No, it still hurts you like normal. I was basing myself on the data the Check option provides you, as they seem to represent the monsters' base stats. The game's actual stats are different, presumably because monsters' ATK depends on their willingness to hurt you(i.e. Toriel has 80 ATK but she doesn't want to kill you, so it becomes 6 instead), and their DEF changes on both that, and how much you want to hurt them(i.e. Mettaton NEO has 9 DEF, but since you're a psychopath when you face him, his DEF becomes -40000. I'm not lying - that's his actual DEF stat).

Snowdrake's Mommy actually has 0 in both ATK and DEF, apparently.