Which one? There are three Trios.
Tao Trio:
Reshiram - Captured during the storyline in Pokemon Black
Zekrom - Captured during the storyline in Pokemon White
Kyurem - Captured in the Giant Chasm north of Route 13
Kami Trio:
Thundurus - In Pokemon White, after obtaining all 8 badges, go to route 7. Walk up to the house where the woman was cooking and she will come out and talk to you. After that, Thundurus is wandering the region, in the south during the morning and north in the evening. If you enter a Route and a giant thunderstorm is raging, go in the wild grass and there is a good chance he will show up.
Tornadus - In Pokemon Black, same way as Thundurus.
Landolus - Get Thundurus and Tornadus on the same cartridge and go to the Abundant Shrine, north of Route 14 to find Landolus.
Musketeer Trio:
Cobalion - After you get surf, surf east of Mistveil to the Mistveil cave. He will be on the top floor.
Virizion - Go to pinwheel forest and he will be there(only after you have confronted Cobalion)
Terrakion - Go to the Pokemon league. Go south and back into the top cave of victory road. Take the top left stairway and follow that path to find Terrakion (only after confronting Cobalion.)
Yes, there is if you bring the three legendary birds Zaptos ,Moltress and Articuno and ,bring it to 4th F the legendary Pokemon appearing is Lugia which can be captured! Source: Tried in white 2 and black 2
2
The two on the box cover art are White Kyurem and Black Kyurem.
reshiram and kyrem
Either Reshirem, White Zekrom, Or White Kyurem. *Extra Detail*; In Pokemon Black 2, It's either Zekyurem/Zekyurom, Black Reshiram, Or Black Kyurem.
pokemon
Regigigas.
The legendary of Pokemon Black ( Reshiram )
Yes, there is if you bring the three legendary birds Zaptos ,Moltress and Articuno and ,bring it to 4th F the legendary Pokemon appearing is Lugia which can be captured! Source: Tried in white 2 and black 2
you can get kyurem
Black and White Kyruem.
2 things there is more than 3 legendary Pokemon in the game and nothing is "unlocked" in the game if that is what you are asking
2
It is Kyurem and Reshiram in White 2, and Kyurem and Zekrom in Black 2.
The password can vary between 2202, 7707, 9909, or the names of the legendary pokemon in black and white 2. Have fun. Pokemon black and white 2 is a great game.
No legendary Pokemon in history can breed. GENDER OR NOT!
You have to defeat the elite four then you can catch the legendary