I might actually have a trading sequence set up to get the Porygon-Z and all data for pre-evolutions without breeding in a sequence. This might work nicely. I'll let you know, but nonetheless, I can still help you with a Porygon-Z trade.
To get Porygon2, you use the Up-Grade. It's on Route 15 somewhere. I just started exploring there, so haven't located it yet. It still needs trading with the Up-Grade.
Carnivine is located on Route 18 in B2/W2; just looked that detail up, and being able to trade backwards would get it into B/W as well if you have two systems (I think I read this is doable). Otherwise, it's found at Ilex Forest or Viridian Forest depending on the game you're playing in Gen. IV, and I'm not at either location or the Great Marsh/Safari Zone yet (Pearl and Platinum I haven't even kicked off officially).
Porygon-Z needs the Dubious Disc, which must be handed to a Porygon2 before trading it (it evolves on trading, which I believe consumes the Disc). The Dubious Disc is located at the P2 Lab off of the Route 17/18 area. If you have a Porygon2, head there and look for it, and I can help trade it back and forth as part of whatever we work out. In fact, I might want to borrow it for a moment mid-trade and pair it with my Ditto in the Daycare so I can get my own Porygon; this particular creature, as you probably know, is a White exclusive and this would remove it from my needs list. Heck, breeding anything like this on borrow would clear my list pretty darn quickly without having to produce new stuff to trade every time, as well. :D Would take too long to do everything that way, however. LMAO
If you don't have them available through HG/SS, no worries. We can do them in Black as well. Saves me transferring them later. I got an offer to help me out from someone in HG/SS, so I'm hoping that one goes through.
That would give me nine starters I'm looking to snare (ten if you want to count Pikachu, or something in its line; it WAS once a starter, after all). What could I trade that would be of interest? I know you said your Dex is pretty complete, but I can offer some SuperZoruas (I should trademark that). Two are in the box now, and I can breed plenty more. :D I can also hatch some Black swarms or other Black exclusives, like Murkrow. Let me know.
In that case, can I shop for starters as well? Namely the original three (though SOMEday I'll have them in SS, it'll take a while to reach Lv.85 to knock out Red) and the Emerald three; I have both Pearl and Platinum, so I can trade those starters around between them...and I have been trying to close a deal to get two starters in SS, but that person seems to have - well - disappeared (see VMs on my page). If you are able to offer two free starters in Gen. IV (HG/SS in this case, and it's Chikorita and Totodile), I need those (I'll import to Black/White 2 someday, and I've caught a trio of Dittos in SS, two of which I can trade). I'm only four Gyms in, so I have nothing spectacular yet, just those caught through the motions, and I've triggered the roamers, but am nowhere close to catching them yet.
I'm almost done my catching via Black, but still have a few more to catch. Working on Route 12, and 13-15 have to be fully explored as well, as well as the Giant Chasm. I still need a lot of White exclusives. Wouldn't mind the Pikachu line either. Learned the way to get the Illumise myself, so will go about that task; however, found someone with a Minun who just caught it and am hoping to set up that trade soon. And I caught my Landorus (in a Dusk Ball during the DAY)! Kyurem is the only catchable legendary left; the Master Ball might be worthwhile to use here. I'll be interested to see whether Lacunosa Town behaviour changes once they learn I've caught the monster. Oh, and I have another Sage or two to find; Chargestone I'm leaving to last on purpose because it serves as a good last fight to finish the task (two grunts)...though maybe the Relic Castle one should be last...then the reward is to battle another Volcarona aside from my own...
Now that I think of it, I have to remember to go back to the Bug-Catching Contest this evening and catch another Pinsir; I released the one I caught last time (it might have won) because I came upon a Scyther, and really wanted its False Swipe. I came 2nd, but I still wanted the Everstone. :D
You said you need Simisear? I know they are a rustling grass in Pinwheel Forest inner area, and of all of them, that was the biyatch to find. I could breed a Pansear if that suffices. Also, Lilligant from Petilil, but I don't have a Sun Stone if you already have Petilil. Eelektross is the same problem, I have one and can breed them but I don't have another Thunderstone (or if I do I'll need it to get Raichu someday, or a Jolteon). Same problem with the Moon Stone, though that might be the one I can buy currently in Black City.
I do know they occur in Dust Clouds, and not having a player for getting Black City recruits from, it's my only way to get stones. If I find the applicable stones at some point, I know I need more White exclusive Pokémon. I'm not sure if you have any of my rather long list in the trade thread? Any number you're willing to trade I can always trade some SuperZoruas for (I'm breeding them with Night Daze already learned).
I'll simplify it. The Route 9 and Route 11 trade swaps are taken care of, and an Abundant Shrine one. So are the Clamperls ATM (I can confirm later 2morrow). So I'm offering you a Zorua with Leer/Foul Play/Faint Attack/Night Daze, and I can use Night Slash in place of anything but Leer (Leer replaced it in that first slot). If you want anything else, ask and I'll let you know, and let me know what you can offer for trade. Magby and Machop are expected in trades 2morrow, as is a Caterpie. That's the simple version.