You lost me at "trading meta".
Lick Gengar will be nice to have and is more incentive to go raiding for it. Gastly candy isn't hard to come by so there shouldn't be any major scorn over Lick being raid exclusive. Lick has at best 1% higher DPS than Shadow Claw and from what I've read that 1% fluctuates from battle to battle. All in all it'll be nice for the collection and I may power one up to compare its use with my Shadow Claw Gengar but I still don't see myself dropping dollars to go wild with raids.
EDIT: Why did you make two threads for this?