From Bulbapedia, the community-driven Pokémon encyclopedia.
Toshiron (Japanese: トシロン) is one of the Ghost Masters located in the Sealed Fort, located on GR Island in Pokémon Card GB2: Here Comes Team GR! Toshiron can be found in the third of the nine statues in the main room. Players who defeat Toshiron will obtain a Present Pack, which can consist of any card that can be found in a booster pack in the game.
Trainer Imprison Deck
Trainer Imprison Deck (Japanese: トレーナーふういんデッキ) is the deck played by Toshiron. The deck features various types of Pokémon and includes numerous cards designed to cause Special Conditions or prevent Trainer cards from being played.