I started a battle against Kyurem. My Serperior was still at the front of my party, so I used it to chip down Kyurem's health a bit until I got KOed by a Super Effective move. I sent out Jellicent next and used Ice Beam to get Kyurem down to red health. Then, I switched over to Camerupt and used Yawn. Finally, once Kyurem was asleep, I began chucking Dusk Balls at it. This ended up being yet another easy capture for me, again taking only like five or six balls.
Returned to Lacunosa Town afterwards. The next thing I'll probably do on this game is catch Tornadus, but I don't know when that'll happen because I haven't decided if I want to use my Master Ball on it or not.