Let's see what I can do here (BTW, I clone legendaries, so take that under assumption). I will cross out what I don't have on my cart. yet but will leave uncrossed ones on another cart.
Those with no formatting I have. Two are bolded: Dialga and Palkia are on my SS cart. and I will point out I used an AR code to replay the Event in which they can be obtained so I could obtain both (they are legitimate Lv.1 acquisitions from that Event in SS involving the Toys 'R Us Arceus).
Speaking of that Arceus, italics (which doesn't seem to show differently in quotes) are ones I will note regarding. I have one Arceus traded to me and one that I ARed into SS for that Dex completion (and for the Event); both are virtually identical in any case, at Lv.100, but I have not imported the SS one into Unova. Giratina I also have from the Arceus Event (Sinjoh Ruins if you're wondering), but I also have a Lv.53 one originally from the Distortion World and was caught in that game by another Trainer. I have ARed the Event Heatran into SS (and imported to Unova), and once again, this is considered acceptable as it's a perfect clone of the Event (you can ask a moderator if you're unsure, I verified this myself with one).
I will check my used Pearl cart. for an existing game and see if I have a Glameow on there to import. If I do, I can try breeding it (since I'm not the OT on that yet, I would rather not use that OT, whatever it is, but might keep them for breeding purposes). For now, I'm assuming I don't have it at all and haven't acquired it in W2 yet myself (or Black obviously).
I can breed Torchic, Mudkip, Stunky (all trades, have to breed my own), and Spiritomb (received yesterday, but if DW I might clone it instead if you want that). LEgendaries I have aside from notes above are Latias (Lv.40 Pewter City version), Rayquaza, a Wishmaker Jirachi, Oblivia Deoxys, Darkrai, Manaphy (I ARed an Egg into SS, but also received another Manaphy that has some battling experience in a trade, so the Lv.1 one falls under Oblivia Manaphy Egg but already hatched; you can breed Phione provided you have a Ditto), Shaymin (also received recently), and Arceus (again, the one I received in a trade, but cloned; not the one I have in SS).
If you're interested, I can clone some of these for this evening or breed the breedables. I crossed off Kyogre as well, as I haven't come to those in SS yet (I'll have to hack Kyogre's "Orb" into there or hack the right Kyogre in there to unlock another Rayquaza someday).