There have already been tons of other threads on this, I'm surprised the moderator didn't delete this one already. In the English speaking servers, you can get a rare on any pull. I got Sage Naruto on around my 14th pull in his box ( that's counting free pulls ) but I have also gone over 70 draw 10's without getting a rare in some boxes. As Jiburiru said in another thread, "It's all based on chance but players have determined that there is a possible chance of a threshold where the likelihood of obtaining something is higher.".