Gardenia
Gym Leader in Sinnoh.
About
Gardenia leads the Eterna City Gym, Sinnoh's second, with Grass-type Pokémon. Fire, Flying and Ice moves work well on her whole team, and her strongest is a level 22 Roserade, which is part Poison too. Beating her earns the Forest Badge.
Gym battle
TurtwigLv 20Grass Knot, Razor Leaf, Sunny Day, Reflect
CherrimLv 20Grass Knot, Leech Seed, Magical Leaf, Safeguard
RoseradeLv 22Holds 
Sitrus BerryGrass Knot, Magical Leaf, Poison Sting, Stun Spore
As of v0.82.0 · engine 0a8ff702