Thanks for the replies. I asked our tournament organizer last week, and she said she didn't know; VGC is new to her.
Our cartridges won't be taken between matches, will they? They do this with decks in TCG top cuts (I know there are no top cuts in VGC), and if there's Wi-Fi, I'd love to save every battle as a battle video and upload it before the next round. Also, are hack checks performed when you register, or are they done randomly (most likely to the players atop the current standings) between rounds?