Black: It generates a powerful, freezing energy inside itself, but its body became frozen when the energy leaked out.
White: It can produce ultracold air. Its body is frozen.
Self explanatory - a thread dedicated to the most obvious contender for mascot of the third game in the Unova series, the gelid terror that fell from the heavens... the Boundary Pokemon, Kyurem.
Now, it is customary for the mascot of each 'third' game to have an even more prominent role in the game's story than that of the other two who came before. Pikachu's role in Yellow version is a good example, as is the hunt for Suicune and your encounters with Eusine in Pokemon Crystal. In Emerald, Rayquaza is summoned in a nice little cut scene after a trip to the Sky Pillar to quell the seismic rage of Groudon and Kyogre, and in Platinum, Giratina rips a hole between its dimension and the 'real world', sending the player into the Distortion World for a final confrontation with that sad autistic guy who can't seem to understand why everyone's smiling all the time.
So what about Kyurem? What role will it play? We talk often of Pokemon Grey, and rightly so; any other name for the third game would seem misplaced. Grey is a blend of black and white, and seems to suggest a kind of balance. But with Kyurem, and Ice type, it may instead refer to absence - the absence of energy, for example, in contrast to Reshiram and Zekrom's fire and electric types, respectively. This is also suggested by Kyurem's role as the representation of the Taoist concept of 'wuji', which is an absence of yin and yang.
But this post is getting a tad long-winded. We will discuss this further in the thread. I know this information is available in many places around the web - I'm just assembling it here to encourage conversation.
Let's do this.