In Pokemon Black 2 and White 2, there were a lot of legendaries, not just from Unova but from other regions as well. I know that Yveltal (I am playing Y version), Mewtwo and the legendary birds are in the game. Are there other legendary Pokemon in the game other than those 5?
Okay, there are seven regular legendaries in the game(s).
The three "letter" (I just made this term up myself) legendaries are:
- Xerneas - Only obtainable in Pokemon X
- Yveltal - Only obtainable in Pokemon Y
You can also catch Mewtwo, which can be evolved into Mega Mewtwo X/Y.
And finally, you can get one of the roaming, legendary bird trio:
- Articuno (if your starter is Chespin)
- Zapdos (if your starter is Fennekin)
- Moltres (if your starter is Froakie)
A method for catching the roaming legendaries can be found here. It's not the same as earlier generations.