Gardenia

Gardenia (Japanese: ナタネ Natane), the Eterna City's Gym Leader, hands out the Forest Badge and uses Grass Pokémon. In Pokemon Diamond and Ruby she has three grass pokemon: Cherubi lv 19, Turtwig lv 19, and Roserade lv 22 a Grass and Poison type. With Roserade, Gardenia uses a mixture of poison and paralyze attacks making for a tough battle. You have to defeat all her students to challenge her. After defeating her you receive the Forest Badge, TM86 (Grass Knot), and the full use of Cut.