Kyurem is the now legendary ice/dragon type pokemon found in black and white versions. To get it you need
-a pokemon who can use strength
-(optional) a pokemon that can use surf
-some high level pokemon
-to have beat the game

Just a note kyurem is level 75 and the wild pokemon all are around level 60

Okay first you have to go to the town directly next to Opeluid; Lacunosa town
If you go to the right of that towns pkm center you run into the next route which is actually open two ways. Go up, you'll need strength, and then you'll quickle find a cave and a broken bridge sourrounded by grass.
Enter the cave and you'll instantly notice the exit. Go right, whether you walk or use surf thats the fastest way to kyurem, althought to the left does take you around and gives you many more items.
But regardless, once your through the cave you'll notice a mazelike area-the Giant Chasm.

Pokemon in the gaint chasm are pokemon like ditto, solrock, lunatone, piloswine, metang, etc.

The Gaint Chasm has a ton of ledges for you to jusmp off of, but be careful because someledges lead you away from item smile . but regardless in the middle of Giant Chasm theres a well hidden lake. you can't see it unless your directly next to it, but's right in the middle. Keep going round until you manage to find the sidepath leading to the lake. Once you find it the entire Chasm will suddenly freeze over, allowing you to access a new cave. inside is the pne and only dragon/ice type pokemon kyerem.

Kyerems sigature move is called glacier, it does pretty good ice type damage, but lowers your speed. a frusterating thing about catching him is that he also knows endeaver, which causes problems when you weaken him enough.

and that's all i can tell you. any questions then please post