Kyurem?
Hmm... wha? The riddle? That was today? Aw, man. I'm late. Alright, let's do it.
So, my name is- wait, what? What do you mean this is going to humans?!
Seriously, dude? I hate humans! Ugh, despicable little creatures. - Said to have eaten humans
They make you feel all special about yourself, and then suddenly, they go and abandon you for centuries, all alone! - Left abandoned after splitting from the Original Dragon
What do you mean, I'm prejudiced? The only one who's seen me in years made off with my children!
Not like my remaining ones are much use... They're almost as old as me, and still immature as ever.
Don't even get me started on their music tastes. I hate rock. Give me a nice bamboo flute any day. - Weak to Rock, strong against Grass
Wait, you're done? Fine, fine, whatever. Just leave me alone. Man, I already gave my guards lasers, what else do they need?
And the hint-
What, you again? What do you want?
A hint? Yeesh. These humans really are stupid, aren't they?
Fine, fine. Uh... how to put this so it doesn't sound cheesy...
You'll find me where my powers are strongest,
But I am unable to reach them. - Drops the DNA Splicers after defeating it in B2W2, but can't become Black/White Kyurem unless the Trainer also has Reshiram/Zekrom
Is that okay? Yes? Good. Get out. Gotta reseal that entrance... Meh, I'll do it tomorrow. - Entrance to its cave permanently sealed after defeating it