00PARTS is a unique monster located between Lohan and Kazas on the World map and in the dimension area of The Moon That Never Sets. It can instantly KO a character, then run away immediately after doing so. It also drops 600 gold upon being defeated as well as a spirit potion. There are two well known methods to defeating 00PARTS, which is described below.
The first and simplest way is to have a Magic Sig Stone in your inventory. Have one character attack 00PARTS for 1 or 2 damage, then the following character throw the stone. After 00PARTS has been blocked, attack it, and repeat the throwing of the stone once the effect wears off. 00PARTS has only 4 HP, but each character only attacks for 1 damage point.
The second method is the fastest, but requires Sachets. A Sachet will automatically damage 00PARTS for 10 HP, killing it instantly. This method is somewhat more difficult because of the farming method for Sachets. See Sachet for details.
On disc 3 it gets easier. Miranda, dancer's shoes, wargod's amulet, and long bow= impossible to miss. So use Miranda, Dart and Haschel (or Meru). First move, 'magic sig stone', second (unless miranda) - 'speed up' miranda, third (unless miranda) - 'slow down' 00parts. Unless 00parts starts with instakill/run= you WILL win. Miranda will get 4-7 attacks by herself: the other characters are just for some unnecessary cushion.
(As for all special monsters, it is recommended you find the Speed Up, Speed down, and Signet Stone repeatable items to help increase your odds of killing said monsters. Good luck.)