KYUREM was a pain in the a**! I used up all of my Pokeballs, which I never stocked up on, I had like 30 when I went into the Great Chasm. I didn't do any research on the Great Chasm and had no idea Kyurem was there, so I was like, I am seriously screwed. I had 30 pokeballs, 1 premier ball, a couple ultraballs, a masterball, then 2 net balls. Ok, so I went through everything except my masterball (where's the fun in capturing a Pokemon if you don't have to even try?), and captured Kyurem with a Net Ball.