The Grass Club (Japanese: グリーンクラブGreen Club) is a group of Trainers who use Grass-type Pokémon in Pokémon Trading Card Game. It is led by Nikki. It appears to be the female counterpart of the Science Club, because the Grass Club has only women and the Science Club has only men. Both clubs use Grass-type cards.
Nikki is not initially present in her Club, one must defeat all of the other Club members to learn of her location. Once found, she will head back to the Club where she can be challenged as many times as the player wishes. Players who are able to beat Nikki will receive the Grass Medal and two booster packs.
At the beginning of the game, the player can come here to challenge Brittany, who upon defeat reveals that Club Master Nikki is hiding at Mr. Ishihara's House. The player can then go there to acquire the Be Gone! GR-2 Deck. The other Grass Club members are near Brittany, and will give the player one pack apiece if spoken to.
If the player is female, GR-2 will appear in the main hall of the club for battle after receiving the deck from Nikki. After GR-2's defeat, both the Grass Club and the Science Club are freed simultaneously. Initially, only Brittany will battle when everyone returns to the main room. When the Water Club is liberated, Kristin will also agree to battle. Once the GR Coin is completed, Nikki finishes building a new deck and will battle if asked.