From Bulbapedia, the community-driven Pokémon encyclopedia.
David (Japanese: ヤスユキ Yasuyuki) is one of the three Club Members from the Science Club, under Club Master Rick, in Pokémon Trading Card Game.
David can be challenged to a 4 prize card match. This is an optional battle, and not required. Upon defeat, David rewards the player with two Mystery booster packs.
Lovely Nidoran Deck
Natural Science Deck
Natural Science Deck (Japanese: しぜんかがくデッキ) is the only deck played by David, played as a 4 prize card match. Defeating David gets the player two Beginning Pokémon booster packs.
At the start of the game, David is available in the communications room of the Science Club, just like Brittany at the Grass Club. Unlike Brittany, however, battling David does not advance the storyline. He will eventually return to the main hall after GR-2 is defeated.