It doesn't have a certain cause, it is just a rare ball that is slightly better than the Great Ball. Don't worry, these are facts, I know everything about Pokemon, now I just quit into YUGIOH.
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Yes, the Ultra Ball has a 4x catch rate than a Premier Ball, which has the same catch rate as a normal Poke Ball. It is commonly used to catch rare or Legendary Pokemon.
Either, master ball, (if you haven't used yours givin to you by professer rowan) ultra ball, or timer ball.
ARCEUS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
no I can be only used for Heart and Silver
I caught mine by surfing in the big lake in the foggy room of mount coronet, I used a luxury ball to catch it and got its health to yellow... :)