Mt. Moon, a colossal peak marking the tail end of the Pewter Mountains, and the greatest divide between Pewter City and Cerulean City. Mt. Moon is famed amongst occultists and weirdos for the number of strange happenings on and around it's rocky slopes. There is a rudimentary Pokemon Center at the base on the Pewter side of the mountain. Most trainers prefer to camp outside and enjoy the scenery.
Trainers have 3 choices when journeying to cerulean.
Mt. Moon Tunnels – the safest and fastest route, taking barely a day to walk through the lit paths within the tunnel, since Team Rocket's activities here during The Giovanni Incident, greater care has been taken to avoid disturbing the local pokemon populations. There is a single, lit path through the tunnel, it is lit by lamps hung from the ceiling designed to direct all of their light straight down, preserving the perpetual gloom of the caves.
Climbing Mt. Moon - the most dangerous, and middle speed option. A trek that takes most climbers at least 3 days, going up and coming down the other side. Climbing the mountain is arduous, Mt. Moon's rocky slopes offer little comfort and no room for error, there are no established trail that wind up Mt. Moon's surface – all this before accounting for the wild Pokemon that call this stony area home.
Hiking around Mt. Moon – the slowest, and moderately difficult path. by sticking to the foothills of Mt. Moon and walking around, trainers are exposed to some of it's rocky beauty, while also having the opportunity to rest in the shade of the outskirts of the sprawling viridian forest. While having the natural beauty lacking in going through the mountain, and being much safer and easier than going over it, walking around the mountain adds nearly a week to the journey.