New story and THIEF

So I've had this idea for a new story for a while now. The basic premise is Twilight discovers a new website that allows her to play Pokemon online. She gets addicted trying to find the 'perfect' Pokemon team.

That's the basic premise, but I'm open to suggestions ( what pokemon she should use). Also since it's Spring Break I might actually start working on this.
(Keep in mind that this would be my first story EVER)

Thief... hella awesome game that you should totally play.