From Bulbapedia, the community-driven Pokémon encyclopedia.
Nicholas (Japanese: ソウスケ Sōsuke) is one of the three Club Members from the Lightning Club, under Club Master Isaac, in Pokémon Trading Card Game.
In Pokémon Card GB
This person is required to duel with in order to reach their Club Master.
Nicholas challenges to a 4-card prize match with the Boom Boom Selfdestruct Deck.
Upon defeat, he awards the player with two Colosseum booster packs.
In Pokémon Card GB2
Nicholas is, together with Club Master Isaac, captured y GR-2 and forced to battle you. He uses the Overflow Deck and challenges to a 4-card prize match. Upon defeat, he awards the player with two Sky Flying Pokémon booster packs.
After the GR Castle is defeated, Nicholas will be using the Energy Conservation Deck.