I am sure you know but Will of Remonia is not tradeable. the pommel jewel that lets you learn the pet is but only to those in the same raid that it drops like other raid loot.

Do you know the name of the pet. If I remember correctly there were a couple of pets that were sold as plush pet and if you bought it you got a code for an ingame pet. The plush pets are no longer available from the store or not I could find.