What is covered in How to Beat Gym Leader: Gardenia (Eterna City) for Pokémon Diamond and Pearl?

Type Specialty: Grass Gym Leader: Gardenia (Eterna City) Pokémon: Cherubi (Lv. 19): Grass. Ability: Chlorophyll.

How do you complete How to Beat Gym Leader: Gardenia (Eterna City) in Pokémon Diamond and Pearl?

Type Specialty: Grass Gym Leader: Gardenia (Eterna City) Pokémon: Cherubi (Lv. 19): Grass. Ability: Chlorophyll.