I think it's in that room where you need a card, you know the one room that you can't enter in the laberynth?
One of the things the Hermit Gunsmith needs you to get him. I've found the Autocharger and Focusing lens, I assume the Pulse Core is in a room similar to those two, behind a panel as well... but I can't find it... :\
Alas, I believe that it's not finished yet, and that part is not in the game yet.
Question still stands - How to you get chacos lipstick? Anyone know?