You can short any stock, pink sheet or otherwise, provided you have a margin account and can find a broker willing to loan you the shares. Most brokers aren't going to loan shares on a stock trading under a dollar. Has this stock been shorted? Sure it has. Is shorting the reason for the penny price? No it isn't. Massive dilution is.
do you know any broker that will allow a retail to short a pinky stock? I have been investing since 1996 and have not found one. So what you are saying is theoretically possible but not practically doable. Is that correct?