Question: how effective are quick balls?
Answer: A quick ball has a 4x chance of catching a Pokemon in Generation 4 games (Diamond, Pearl, Platinum, Heartgold, and Soulsilver), and a 5x chance of catching a Pokemon in all games after that, but only on the first turn in battle. After that turn, the ball's odds drop to 1x, which is equal to that of a Pokeball.