From Bulbapedia, the community-driven Pokémon encyclopedia.
The GR Psychic Stronghold (Japanese: 超のGR団のようさい Super GR Teams) is a location found in Pokémon Card GB2: Here Comes Team GR!. Every TCG player in GR Psychic Stronghold focuses on -type Pokémon cards.
Grand Master Rod is imprisoned in the top room of GR Psychic Stronghold, but Mami, the Fort Leader, frees him after being defeated by the player. Other members of GR Psychic Stronghold include Kevin, Miwa, Yōsuke and Ryōko. If the player defeats Mami, he/she is awarded with the GR Psychic Coin.