Mt. Moon

Mt. Moon lies between and Cerulean City. It is introduced when, and  visited there in. Due to the pure darkness inside, Pokémon that can live in darkness can be found often in this place.

Part Red & Green
Mt. Moon is mentioned for the first time in, when and his friends visited there. Eusine stated that the place was hit by a meteorite centuries ago. According to the belief, Pokémon from space have landed on earth and they began to live there. In a long time, Clefairy, Clefable, Jigglypuff and Wigglytuff became the Pokémon that have come from space and lived on earth afterwards. Once Redwald and friends got in there, they heard an explosion and followed the sound. As a result, they have encountered Professor Joshua and his Pinsir. As the Professor claimed, he was attacked by two men in black uniform. Eventually, he revealed that he was there to search for some fossils. As Redwald and friends helped him, they found two fossils in the end. Joshua gave the Helix Fossil to Redwald, while he kept Dome Fossil.