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Dusk Ball > Ultra Ball
Dusk Ball has x2 effectiveness when used in a cave, and plus x2 more when used at night. So it's x4
Ultra Ball has x2 effectiveness.
Also, remember to put up some status effect, like Paralyze/Sleep.
They are in caves,well the first two so Dusk.Mespirit maybe a masterball,but you might want to save that.Quickball is great just once and you might catch it.Be sure to save!^^
On a more serious note, my strat is to use about 60 ultra balls, if you fail to catch it, hit it with timer balls (w/e the name is), I caught one of my legendaries like that and another one with a heal ball o.O.