Dangerous Rogue

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Hi! I haven't played pokemon in a long time, not since the first generations, and I've been thinking about buying the new one, and a 3DS to play it, but before I do I have a question about some things:

In Black and White/2 there are some legendary pokemon Kyurem, Zekrom, and Reshiram. Can you catch these pokemon in X and Y? or do you have to transfer them from a Black/White game?

Also, can you catch the birds from Gen 1 like Moltres and Articuno?

Basically, I'm asking, is if you had 2 games, would it be possible to catch all of the pokemon without dealing with another person (not that I'd want to)?