Kaitou! Pokemon 7

Phantom Thief Pokémon 7 (Japanese: 快盗!ポケモン7 Kaitou! Pokémon 7), is a one-volume Pokémon manga based on the Pokémon Diamond and Pearl games. It is written by Miho Asada, the author of the Pokémon Gotta Catch 'Em All manga. A sequel manga, Phantom Thief! Pokémon V, was later released.

Chapter 7-8
Lilly (Hiori's twin sister) is mind controlled by Team Galactic.

Lily has the power to read Pokémon's aura. Because of this power, she was kidnapped by Team Galactic when she was only five years old while playing a game of hide and seek with Hiori and his Riolu. Lily was shown to be at a high rank in Team Galactic, working along with her section leader's second-in-command and receiving missions from her in person.

Later, it was revealed in a battle with Pokémon 7 that she had lost all memories of before she was kidnapped and is currently being brainwashed by her Mismagius.