Back in the original Pokémon Red and Pokémon Blue games, it was possible to fish for Pokémon inside the many Rhydon statues that Pokemon Gyms are adorned with. Using an Old Rod on any Rhydon statue will cause the player to encounter a Magikarp. You could also fish for Pokémon like Goldeen and Poliwag in the watery areas of the Cerulean City Gym since it takes place in a pool. You won’t find any particularly rare Pokémon, but there is a novelty to saying you caught a Pokémon from inside the Gym.