Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-26242189-20160806194341

Mettaton NEO has -40k DEF.

DEF dictates how hard or how soft you hit. A DEF of 9999 would cause the same effect as 99999 beause at 9999 it would be a miss.

Also, http://rawr.ws/undertale/monsters This is my source. The STATS of the monsters are in the code. It's not faked, because there's nothing to change it. If it says X in the code then the DEF is X.

Also, the whole "LV effects how hard you hit" can be proven BS for Metta NEO, Sans, and Asgore. Mettaton NEO will always loose more then 30k HP, despite your best efforts not to. Sans will always take 99999 DMG, and Asgore will always take like 9999999999 DMG (Somwhere around there).

And might I add the (Numbers in Parenthesis) next to the ATK/DEF stats on the wikia pages shows the GAME FILE stats.