From Bulbapedia, the community-driven Pokémon encyclopedia.
Pierrot (Japanese: ピエロ) is one of the Ghost Masters located in the Sealed Fort, located on GR Island in Pokémon Card GB2: Here Comes Team GR! Pierrot can be found in the fourth of the nine statues in the main room. Players who defeat Pierrot will obtain a Present Pack, which can consist of any card that can be found in a booster pack in the game.
Blazing Flame Deck
Blazing Flame Deck (Japanese: もえさかるほのおデッキ) is the deck played by Pierrot. The deck consists entirely of Pokémon.