You can only get latias in pokemon black 2 by link trade or poke-transfer, but you can get latios in pokemon black 2.
If you have Pokemon black 2 and have defeated the champion, it's in the dream yard
Yes.
Crystal is a GEN:2 game while Latios is a GEN:3 pokemon. (so no)
Yes, Latios will return in Pokémon Black 2 after defeating him. You just need to return to the Pokémon League building and defeat the Champion in order for it to return.
You would need to trade for them from Pokemon Black or White, for they are not available in Pokemon Black 2.
In Pokémon White 2, Latias can be found in the Dreamyard but Latios will not be available in the game. Latios will be available in the Dreamyard in Pokémon 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.
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.
Crystal is a GEN:2 game while Latios is a GEN:3 pokemon. (so no)
In black 2 you get Zekrom, Black Kyurem, Latios, Electibuzz and get to go to Back City. I white 2 you get Reshiram, White Kyurem, latias, Braviary and get to go to White Forest. In Black City you can vs high level Pokemon trainers and buy more items and in white Forest you can catch some Pokemon that you can't catch in Black 2. The rest of the game is the exact same so you decide witch one is better.
After beating the game, you can go to the Dreamyard to find Latios if you are playing Pokemon Black 2 or you find Latias in Pokemon White 2, and after capturing them, they will leave behind an item called the Soul Dew.
You cannot catch Rayquaza in Pokemon Black 2.
no you cannot but you can battle latias/latios
Yes, Latios will return in Pokémon Black 2 after defeating him. You just need to return to the Pokémon League building and defeat the Champion in order for it to return.
In black 2 you get Zekrom, Black Kyurem, Latios, Electibuzz and get to go to Back City. I white 2 you get Reshiram, White Kyurem, latias, Braviary and get to go to White Forest. In Black City you can vs high level Pokemon trainers and buy more items and in white Forest you can catch some Pokemon that you can't catch in Black 2. The rest of the game is the exact same so you decide witch one is better.
You would need to trade for them from Pokemon Black or White, for they are not available in Pokemon Black 2.
no
In Pokémon White 2, Latias can be found in the Dreamyard but Latios will not be available in the game. Latios will be available in the Dreamyard in Pokémon Black 2.
You cannot catch Keldeo in Pokemon Black 2. You have to have received it from an event or from someone else.