Actually, I picked up the Spiritomb; got surprised with one today and had to come up with an extra Pokémon in my PC to offer for it. LMAO
Starly, Burmy, Shellos, and Glameow are the main ones whose families I'm still missing (I can accept any evolution, too, as I am doing a breeding center in any case someday). I think I'm getting Snorunt and Kecleon over Monday sometime in another trade, which will give me the full group of every Hoenn breedable. In other words, if I acquire those four remaining Sinnoh breedable families before I go into the Sinnoh games, my breeding shop can open (not to mention once I complete the Dex pre-legendary, I can start prepping for the second E4; I already have a group of Lv.74 on standby, but have to plan the Champion battle so still have work to do). Also have to start doing the Battle Subway and earn the remaining TMs. Still have to catch some SS legendaries including Ho-oh at Lv.70 there. So basically, factoring SS in (plus the Dialga and Palkia there at Lv.1 - legit. BTW), I'm four Sinnoh breeds (listed above) and five legendaries (getting to that) from being able to achieve full Dex completion. Any help with one of those would be very much appreciated to save me the Sinnoh transfer later.
If a legendary (since I'm offering a Regice, that makes sense, but literally any of these nine of either status will work), I can leave the room, clone, and be back in 5-10 minutes to send it (the original) right back. I have several people I've traded with who can vouch for me being safe to trust for cloning. In the case of legendaries, I have remaining to find: Uxie (480), Mesprit (481, which you are seeking), Azelf (482), Cresselia (488), and Meloetta (648). I didn't count Kyogre and Groudon from Hoenn as they can also be found in SS (well, one of them; I'll see later, at the right time, whether using an AR code for the opposite orb unlocks the other as well, but if not, I have a code to get the other in my PC as well to import). The first four of those legendaries I'll be trying someday to catch in Sinnoh (two games!), but again it saves me having to import them later if I get them now. Meloetta I may wait for a Movie Event (I predict soon for B2/W2) to get.
Yipes, I got lengthy.

NEway, while I'd like one of those above, if you don't have them, I'll give you the Regice clone since I got the original I was seeking. If one of the five legendaries I named is offered, I'll trade the original back for a Junkémon after cloning (I have to change systems to clone, but can do it very quickly once loaded).