The Fuchsia City Gym is the Gym of Fuchsia City. In this Gym you face Trainers who use Poison-type trainers, including the Gym Leader Koga (Red, Blue, Yellow, FireRed, LeafGreen), or Janine (Gold, Silver, Crystal, HeartGold, SoulSilver). The trick is that there are invisible walls. In Red, Blue, Yellow, FireRed and LeafGreen, these walls are perfectly invisible, in Gold, Silver and Crystal, if you look closely, you'll see dots which line the walls. In HeartGold and Soul Silver, If you bump into an invisible wall, it will reveal itself making it easier for you to navigate the gym. In Pokémon Stadium and Pokémon Stadium 2, this gym had purple sludge pouring from out the windows. Defeat the Gym Leader and you get the Soul Badge.