Yes this would be a great idea , but queue is already not active of normal/ranked pvp in both of the servers, we need something to attract players to participate in pvp or merge the server.
Adding Gen 1-9 ladder / Monotype will further affect the normal/ranked pvp. Adding z-moves will be ok but we need some other pokes of gen 7 to balance the meta. Like always, staff will ignore this topic probably. .