There are extremely valid strategic reasons to have a pocket listing.
Unfortunately, the definition of 'pocket listing' is unclear.
Is a pocket listing a home that the owner has suggested is for sale, all you need to do is bring a buyer. No docs signed or initialed...possibly not even a handshake. (i.e. just about any DIY seller)
Is a pocket listing a property that is for sale and you have arranged with the owner your compensation in writing or verbally?
Is a pocket listing a property that is for sale and the owner has entered into a listing agreement but requests to not be placed in the MLS?
Would an exclusive listing, a listing where no co-broker agreement is in place be a pocket listing?
Pocket listings, to be of any value, must be part of your business strategy, not a request of the home owner. One is a winner, the other a real loser. On the losing side of the coin, if the home owner is requesting action that will sabotage the ability to sell the home, you should defer all advertising costs to the owner....prepaid. After all, it's a business not a hobby.
A part of your question included '...before it goes on the MLS?' Sounds to me as though, by my definition, you have a delayed listing, not a pocket listing. There is just too much we do not know regarding your situation. As you know,,,what you can and can not do is spelled out in the contracts you have entered into. On the surface, this does not appear to be a business strategy, but more akin to the practice of accidental real estate. Could be a waste of time.
My pocket listings are sold through a simple message, "Banks turned you down?"