What is the best pokeball to catch Cresselia?

Answer 1

An Ultra Ball or a Master Ball. Carry up to 50 ultra balls (and maybe more; Cresselia is a hard-to-catch Pokemon), and weaken the Pokemon as much as you can. Once it's at the weakest you can get it without it fainting, start throwing Pokeballs at it. (If you can, try to paralyze it or put it to sleep. Do not poison it though; it'll lose health and the Pokemon will faint before you can catch it. Also, legendary sometimes will "run" away in a while battle...To make sure that doesn't happen, carry a Pokemon who has a move (such as Mean Look) to prevent it from running)

Don't use a Master Ball unless you have to...Master Balls are used for a right-away capture...And they're the rarest of balls. If you can, try to catch the Pokemon with balls you can buy.

In rare occasions, a Heavy Ball or Dusk Ball. Cresellia isn't that heavy, but if you don't have any ultra balls (or not enough), use a Heavy Ball to capture it. And, if you try to catch the Pokemon at night, use the Dusk Ball (works best in a cave or at night). Both, un-necessary if you have Ultra Balls.

Answer 2

you use a timer ball for 100 tries