I'm still wandering about on Routes 6 and 7, so no idea yet. However, my understanding is that it's done within the battle screen somehow. You might have to reach a certain point in the game to actually learn how to do it, however. After that, the option is available.
The one from Black 2, yes. Just have to move Braviary over and eventually clone it. Since my Join Avenue shopping is hampered by switching the game between systems, I have it in the 3DS ATM and can trade it to Black on the DS to clone, then trade it from there and possibly keep it in Black until I get the maingame completed (at which point I can breed in both games and can prep. breeding stations for different things in each game).
No worries. I got Kyogre in any case, as well. Definitely going to make sure I keep untouched clones, probably copying the ones not available in B2/W2 itself to that game (again, clones, these being backups in case I ever forget to clone), then I should be good to do whatever. I'm now 50 Pokémon away from a full Pokédex, and 49 of them I can breed or level up myself. Power's in my hands now. :D
I was contacting you, explains lack of answer. And no, don't need Zapdos. I'll be catching the entire trio in SS someday, and the big trade already had all three involved. Let's both evolve the one we need, trade back, and off we go.