User blog comment:HS664/Already!?/@comment-2221250-20130108213135/@comment-2221250-20130108214241

It stands for Video Game Cup. It's a Wifi Tournament where every battle is a 4 on 4 Double Battle. Teams must be made SPECIFACALLY for these battles. And, the winner is irrefutably considered the Best Pokemon Trainer on the Planet.

Plus, in the final battle you get to hear this.