Mitch won't duel the player until they have beaten Jessica, Michael and Chris. The three are hidden in various Clubs, but after they are beaten they will come back to the Fighting Club. Players who are able to beat Mitch will receive the Fighting Medal and two booster packs.
Mitch was captured by Team GR at the beginning of the game. When the player first visits the club, Michael is in the side room and will battle with the player.
After GR-1 is defeated, all members move to the main hall; if the Water Club is not liberated by this point, Michael remains the only member who can battle the player. When the Water Club is freed, Chris will also agree to battle. Once the player has acquired all four pieces of the GR Coin, Michael will upgrade his deck.