Of course you can
2nd answer: the only nonunova legendaries you can catch are heatran, latias (white 2), and latios (black 2). You need to make black kyurem (black 2) but white kyurem (white 2) can't be traded. However, if you don't have black kyurem, you can make white kyruem, but only if you've caught kyruem.
Dialga and Palkia are unobtainable in Black 2 (or any other game in Generation 5 (BW, BW2))
can you TRADE for a pansear on POKEMON WHITE 2!
Darkrai cannot be found in Black 2. (Or Any of the BW, BW2 games). You need to either transfer from a previous generation that has Darkrai or ask a friend.
no. get it from a trade or another game then trade the pokemon from that game to pokemon black version2
not, you need to use poke-transfer to get one.
Any
You cannot catch Rayquaza in Pokemon Black 2.
You would need to trade for them from Pokemon Black or White, for they are not available in Pokemon Black 2.
Some say that you can find it in flocessy ranch or in a route with about 3 ledges in a row in pokemon black 2 without any cheats
no
Dialga and Palkia are unobtainable in Black 2 (or any other game in Generation 5 (BW, BW2))
You can only get latias in pokemon black 2 by link trade or poke-transfer, but you can get latios in pokemon black 2.
You cannot catch Keldeo in Pokemon Black 2. You have to have received it from an event or from someone else.
You can't
A trade is required
You cannot catch Meloetta in Pokemon Black 2 and White 2. You have to receive it from an event, but as of right now, it has not yet been announced for North America.
Rufflet cannot be caught in Pokemon Black 2, you must trade from White 2 or White.