legendary pokemon

There are Fifteen Legendary Pokemon that you can find in Pokemon White 2:

Reshiram - After you defeat N, he will give you a stone. If you bring the stone to Dragonspiral Tower, it will turn into Reshiram.

Kyurem - After you have caught Reshiram, you can find Kyurem in The Giant Chasm. After you catch it, you can find the DNA Link. This item allows you to change Kyurem's Form.

Virizion - Can be found on Route 11.

Cobalion - Can be found on Route 13 after you see it on Route 6.

Terrakion - Can be found on Route 22.

Heatran - Can be found in Rebirth Mountain, once you have obtained the Magma Stone.

Cresselia - Can be found on the Marvelous Bridge, once you have obtained the Lunar Wing.

Latias - Can be found in the Dreamyard after you have completed the Game.

Azelf - Can be found on Route 23 after you talk to Professor Juniper in Heart Cave.

Uxie - Can be found outside the Nacrene City Museum after you talk to Professor Juniper in Heart Cave.

Mesprit - Can be found on top of Celestial Tower after you have talked to Professor Juniper in Heart Cave.

Regirock - Can be found in the Underground Ruins after you solve the puzzle.

Registeel - Can be found in the Underground Ruins, if someone shares the Steel Key with you via the Unova Link.

Regice - Can be found in the Underground Ruins after you have obtained the Iceberg Key.

Regigigas - Can be found deep inside Twist Mountain. You can only battle it if you have Regice, Registeel, and Regirock in your Party.

All other Legends can be obtained by Trade or an Action Replay Code.

Hope this helps!