Or, a more serious answer:
- If it's on HeartGold, and it's roaming: Fast Ball, Quick Ball, or if you trap it, do it at night with Dusk Balls, and if it lasts for a very long time, Timer Balls.
- If it's on SoulSilver and it's stationary, just Fast Balls (it has base 110 speed), Dusk Balls (do it at night), Timer Balls.
But the idea about False Swipe (Scizor is brilliant due to it's massive attack stat and resistance to Latias' moves), and paralysis, is very sound advice. If it's roaming, you'll need something that can either outspeed to use Mean Look, or has a trapping ability (Dugtrio can learn False Swipe, so get one with Arena Trap). However, you need to keep your trapper alive at all times.