My FC is 2966 8247 3513. You said you had a Virizion to trade for it. If it's an English Virizion I'd like it. I already have a Japanese one. If the one you have isn't English then you can trade whatever.
Alright, idk if I'll be home for the rest of the weekend but tell me when you want to trade and I'll see if I can make that time. Btw check my trade thread out and see if you can trade something I don't have already. I have more than what's listed there but whatever. I can clone whatever you're trading if you need that.
Try 16 first. If you don't get it check to see where you landed and adjust accordingly. You should land either on 266, a little under it or a little over it so it shouldn't be hard to adjust.
If the nature you get is not near 266 then probably the 343 one is the correct starting point.