Is it really possible to do the shoulder Move in the Post

At Will , i'm starting to hear that it is possible if so how do u do it ? and how do u counter it

I've never been able to do it but I can counter it by holding down the take charge button when you see it coming.

Thanks !!

It's done when holding the ball and pushing the 'drop-step'/'pro-hop' button. It doesn't do it every time, but if your down low with the ball it's a fairly good chance of it happening...
And yea, take charge sometimes works to defend it, but I often just let it happen and then try to go up for the block as quick as possible if he's going for the shot; it actually becomes a rather easy shot to block if your up quick enough.