If you use a Dusk Ball inside a cave, it will always be at its most effective catch rate. However, you need to use a Dusk Ball between 8pm and 3:59am outside caves to take advantage of its 4x catch rate. This is the game's night-time mode and Dusk Balls are more effective during this time.
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It's called a dusk stone and it evolves murkrow and misdreavus. You can look up more about it on serebii.net.
First u need a female snorunt, poke'radar required and anytime of day. (to get poke radar c all 210 Pokemon i sinnoh pokedex, then show Pro.Rowen.) or migrate it from emerald or Sapphire or ruby. then use a dusk stone on it.(if not dusk then dawn)
The following is not part of the answer, just part of the story. My friend somehow got me 18 dusk balls for the price of one. (on my Pokemon pearl version) He told me it was a secret. I'd just like to know how he did it. (I didn't even have a cheat engine!)
Get his/her health into the red zone, and paralyse/put it to sleep. Then toss Ultra balls, Time balls and Dusk balls.it takes ages but keep on throwing dusk and ultra balls . soo get lots of them first .ANSWER: For uxie and azelf use dusk and ultra balls when there HP is red and they are either sleeping paralyzed poisoned or frozen and for mespirt use ultra balls and some quick balls at the start and timer balls after about 20 turns. Also shout 'gotcha' into the mic and continuously press B to have a better chance of catching them!
by using a dusk stone