From Bulbapedia, the community-driven Pokémon encyclopedia.
Miwa (Japanese: ミワ Miwa), also known as GR-4, is a member of Team Great Rocket from Pokémon Card GB2: Here Comes Team GR!.
Like a couple other Team Great Rocket members, she has disguised herself behind a mask with a symbol on it, so little about her real appearance can be said. In Pokémon Card GB 2, she has taken control of the Psychic Club. Right after defeating the original Psychic Club Master, Murray, she can be challenged in a 6-prize duel. Her deck, the GR-4 Deck, focuses on and Pokémon. When she is defeated, the player is given one of both Team Rocket's Ambition and Island of Fossil booster packs and one piece of the Team Great Rocket coin.
She appears again in the GR Psychic Stronghold. She can be challenged to a duel, but only if the player's deck has only Energy cards. She uses the Direct Hit Deck (Japanese: ちょくげきデッキ), and when defeated, she hands out one of both Team Rocket's Ambition and Beginning Pokémon booster packs.