"What is the Sherdock arc?" you may ask, well...
In the chapter 142, Monkey Punch (Yes, himself) is tired to write Lupin III so he creates the character of Sherdock Shoock, specially to kill Lupin and his friends.
The autor Vs. The creation. https://t.co/Cp9g5nodR9
"So, speaking of freedom, I mean, it's just like when Lupin goes abroad, overseas, you never really see him have a passport. There are no boundaries for him, he's a free roamer."
-Monkey Punch at an interview from AnimeNewsNetwork (2003).