I know that you need to play the game boy advance game in the tournament, but do they supply you with a new game? Or do you get to use your current Pokemon? Oh, and if so, do they have to be at a certain level?
OK... I beleive that your talking about the R/S Challenge, which you should keep in mind is not really the Tournament Structure that POP will follow. Its simply a means of "introducing" both games to the GBA and TCG players.
But anyways, you have to bring your own GBA and game with a team of 3 Pokémon that are no higher than Lv. 50 (Groudon, Kyogre, and Rykuza are not allowed). The only thing they will provide are the GameLink cables.