From Bulbapedia, the community-driven Pokémon encyclopedia.
Grace is a member of Team Great Rocket from Pokémon Card GB2: Here Comes Team GR!. She's one of the Trainers at the GR Fighting Fort.
Her deck, Full Strength Deck (Japanese: ちからまかせデッキ), focuses on Pokémon. She will not duel against the player unless this uses a deck with only Energy cards.
When defeated, she gives out one of both Team Rocket's Ambition and Sky Flying Pokémon booster packs. She and Gōda must be beaten before the player can challenge Kamiya, the Fort Leader.
When the player beats her for the first time, she reveals a chest containing a rare Dugtrio card.