The Iceberg Key is an item from Pokemon Black 2, and it's used to open the entrance to the White Tree Hollow, a location where you can find the legendary Pokemon, Kyurem.
Here's why you can't get the Iceberg Key in Pokemon White 2:
* Game-Specific Item: The Iceberg Key is specifically tied to Pokemon Black 2, and it's not present in the White 2 game.
* Different Storyline: White 2 and Black 2 have distinct storylines, and their world maps and events differ. The Iceberg Key is a part of Black 2's narrative.
To obtain Kyurem in Pokemon White 2:
1. Trade with a Black 2 player: You'll need to trade with someone who has Pokemon Black 2 and has obtained the Iceberg Key.
2. Obtain a Kyurem: They can then trade you a Kyurem they caught in the White Tree Hollow.
Note: You cannot catch Kyurem yourself in White 2 without the Iceberg Key.
Let me know if you have any other Pokemon questions!