From Bulbapedia, the community-driven Pokémon encyclopedia.
The GR Lightning Fort (Japanese: 雷のGR団のトリデ Toride Thunder GR Group) is a location found in Pokémon Card GB2: Here Comes Team GR!. Every TCG player in GR Lightning Fort focuses on -type Pokémon cards.
Grand Master Steve is imprisoned in GR Lightning Fort, but Ichikawa frees him after being defeated by the player. Other members of GR Lightning Fort include Renna and Catherine, who is also the Fort Leader. If the player defeats Catherine, he/she is awarded with the GR Lightning Coin.