Hmmm that's definitely a doable goal. The gym league will most likely get renovated when X and Y come out- that will be your chance to send in your application. I'd be more confident to apply for a Psychic gym leader spot, but I'm going to be in college when X and Y come out.
And no problem with the set, I used it on my old Gallade when I wanted to make an original set that wasn't taken from lolsmogon.