According to Bulbapedia, Drapion may come from Dracula (because of its "vampire-looking" teeth), Inkay and Malamar may have been inspired by the Vampire Squid, while Misdreavus may be based on a "Lang Suir", a type of vampire in Malaysian mythology
19 Finding the highest number was quite easy: starting form our record, I searched the following number, picked the first result and read until their chain was interrupted, again and again, until I couldn't find any result
8 After a little research I found out that the highest number reached is 2164 (!!!) on 28 Dec 2014. The counter was mercilessly reset by Ame herself. (page 214)