I found out that Stantler cannot be obtained through X/Y except by import, so I might throw some baby Stantlers into the Wonder Trade after I fill a box for import from Black. Their only appearance in Gen. V also is the Abundant Shrine, but only in B/W (not B2/W2).
I recently brought some of the male Charmeleon in from a previous breeding activity in Black, trying to get a female for a trade there a long time ago. I succeesed but had two or three lines of males. Four have been traded, and I ended up getting two just-caught Fletchling (one from Spain however, may keep it despite Lv.2). I'm going to assume they were new players. I did get a baby Dratini with Extremespeed on the first trade, so it wasn't all bad. Also got a Spanish Scatterbug; I'll Vivillon it sooner or later.
I plan to also continue breeding Zorua in Black (though I'll get my Ditto out of the daycare for that breeding between two Zoroark with the same movesets).
Unfortunately, speaking of that Ditto, it seems I have a hacked Ditto of some sort. Nintendo did not allow me to transport a clone of it (BTW, the box I just transferred is all clones, so don't say cloning is the issue). So I'm going to have to see if anyone has a saved perfect Ditto that does transfer to X/Y that I can acquire. I'll have to use SS to bring forward some Shiny Nincada clones for that deal, perhaps, since my actual Shiny is currently in SS (originated in Hoenn, but clones of the original still in SS are in W2, but not sure if in my copy of Black ATM and will have to import there).
I also plan to import the Unown alphabet and start wonder-trading letters. I know they only learn one move, but for newer players who can't catch them even in Gen. V, they might be a nice treat!