From Bulbapedia, the community-driven Pokémon encyclopedia.
Sam's Practice Deck is a Theme Deck from Pokémon Card GB2: Here Comes Team GR! for the Game Boy Color. Due to it being used only by Tech Sam in a practice battle, the cards are dealt the same way each time, and therefore some of the cards listed below may never appear during the duels.
There is another separate decklist that Sam uses in Pokémon Trading Card Game.