The strategy guide says two different things. It says to get an EC everywhere except Bevelle because of the order it has told you to do things. Then, in the 100% In One Game guide in the back, it tells you to get an EC from everywhere. I have played several times, and concluded that to get the Mascot dress sphere you simply need a certain number of ECs, not in any particular order or at least one from everywhere (except of course the Zanarkand glitch). So, if you have gotten an EC from everywhere except Bevelle and haven't gotten the Mascot, then either do a few more ECs or go to Bevelle, it doesn't really matter.