From Bulbapedia, the community-driven Pokémon encyclopedia.
Ryōko is a member of Team Great Rocket from Template:Card GB 2. She's one of the Trainers at the GR Psychic Stronghold.
Her deck, Pokémon Power Deck (Japanese: ポケモンパワーデッキ), focuses on Pokémon. She will not duel against the player if this has any Trainer Cards in the active deck.
When defeated, she gives out one of both We Are Team Rocket and Island of Fossil booster packs.