There are lots of different things to do at that point in the game, but the next place you are directed to is the Cave of Being on route 20, to start the hunt for the lake trio from Diamond and Pearl.
no just one or the other
You would need to trade for them from Pokemon Black or White, for they are not available in Pokemon Black 2.
In the new pokemon black and white version 2, in the main story, something happens by accident and kyurem fuses with reshiram if you're playing pokemon black, but fuses with zekrom in pokemon white.
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 can't. You'd have to transfer it from a Pokemon Black/White/Black 2/White 2 game or trade for one on the GTS.
You can't make it transform in Pokemon Black, only Black 2 or White 2.
no just one or the other
i'm sorry to say that you can't catch black kyuram in black and white. i've tried every way i can think of. but you can get it in black 2 and white 2.
Black Kyurem is in Pokemon Black 2.
actually, you need to get zekrom to get kyurem
You cannot catch Rayquaza in Pokemon Black 2.
Yes, you would be able to trade your Reshiram from Pokémon Black over to Pokémon Black 2 in order to get White Kyurem however you will still need to catch Kyurem in the Giant Chasm but you won't be able to do that until you catch Zekrom in Pokémon Black 2 in the Dragonspiral Tower after defeating N in his Castle.
You would need to trade for them from Pokemon Black or White, for they are not available in Pokemon Black 2.
In the new pokemon black and white version 2, in the main story, something happens by accident and kyurem fuses with reshiram if you're playing pokemon black, but fuses with zekrom in pokemon white.
Technically, this move is hidden within the game and so NO pokemon can learn it, including kyurem. However, it is highly speculated that kyurem will be able to learn it in Pokemon Black 2 and Pokemon White 2.
no
You can only get latias in pokemon black 2 by link trade or poke-transfer, but you can get latios in pokemon black 2.