Board Thread:General Discussion/@comment-32237043-20160626014030/@comment-30501299-20161208093414

Whilst it technically says he has 1 HP in the files, those same files give Metaton Neo -40000 def, Toriel 6-8 ATK, 0 or negative defense, and only 440HP, less than Papyrus, Undyne the Undying has 0 def and 7 attack and Gaster (who is still in the void or something) has 6666 attack so I think the code is just how the stats play such as low def for Neo and Toriel because of the hate behind attacking them and 0 def for undyne and only 7 attack to represent how your DETERMINATION makes you so powerful at that point. considering he took damage from Flowey in the True Pacifist run with the fines choking everyone and chacking his skull he clearly must have some number of HP, his ATK and DEF might even be more but with maxxed out def every attack only does 1 damage and the low HP and def is as a bug fix for the 9999999 damage, also sleeping brings you past max HP and Sans does a lot of sleeping.