Here's how it works:
* Increased Catch Rate: A Quick Ball has a much higher catch rate than a standard Poké Ball when used on a Pokémon that appears on the first turn of battle.
* Limited Effectiveness: Its catch rate drops significantly if used on a Pokémon that appears on the second turn or later.
* Useful for Early Encounters: Quick Balls are particularly effective for catching Pokémon at the start of a battle, especially if you want to avoid a lengthy battle.
In summary, a Quick Ball is a valuable tool for catching Pokémon quickly, but its effectiveness is limited to the first turn of battle.