From Bulbapedia, the community-driven Pokémon encyclopedia.
Magician (Japanese: マジシャン) is one of the Ghost Masters located in the Sealed Fort, located on GR Island in Pokémon Card GB2: Here Comes Team GR! Magician can be found in the second of the nine statues in the main room. Players who defeat Magician will obtain a Present Pack, which can consist of any card that can be found in a booster pack in the game.
Immortal Pokémon Deck
Immortal Pokémon Deck (Japanese: ふじみのポケモンデッキ) is the deck played by Magician. The deck features mostly Pokémon and includes numerous cards designed to prevent damage or leave the battle when weakened to prevent the claim of prize cards.