From Bulbapedia, the community-driven Pokémon encyclopedia.
A Club Master is the highest ranking member of a Club in Pokémon Card GB and Pokémon Card GB 2.
In Pokémon Card GB, they award Medals to players who defeat them in a duel as well as two booster packs.
In Pokémon Card GB 2, they give out Coins, except for Rick and Mitch, which was kidnapped at the time when the main player travel around the first island. These two kidnapped Club Masters, along with the four Grand Masters awarded promotional cards instead of coins as a thanks for freeing them on the second island.
They are the Card GB counterparts to the Gym Leaders.
