What is the catch rate of the Dream Ball?

Question

When you go into Entree forest in Black, Entralink, a Dream Ball appears in your bag magically. What's the catch rate for it?

Answer 1

100%. It always catches.

Answer 2

100% Baisacally the same as a masterball. :)

Comments

Please do not answer questions that already have a good and accurate answer unless you can add a lot more information.
I'm not trying to be mean, I just want to make sure the rules are understood ;)