Cinnabar Island is a small volcanic island off the southwest coast of mainland Kanto. It might be small, but there are a ton of things to do!
Pokemon Center and Poke Mart
The Pokemon Center and Poke Mart are located at the south side. Heal your team so you will return here if the entire party gets knocked out. You will also want to take out the fossil you receive from Mt. Moon, and the old amber you got from the Pewter City Museum.
The large building to the west of the Pokemon Center is the Pokemon Lab. They do a lot of research relating to Pokemon here. In the first office are three Pokemon Trainers who are willing to trade with you. One will give you an Electrode for your Raichu, one will give you a Tangela for your Venonat, and one will give you a Seel for your Ponyta.
The second office has two scientists. One of them will give you TM35 Metronome just for speaking with him. Metronome is a special attack that will randomly use any of the attacks from the first generation of Pokemon.
The third office is where the real magic happens! Speak with the scientist next to the large machine in the back of the room. He will use the DNA from fossils you’ve found around Kanto to revive ancient Pokemon. After giving a fossil, exit out of the building and immediately re-enter. Speak with the same scientist in the back office to receive the Pokemon.
The Helix Fossil will yield an Omanyte, the Dome Fossil will yield a Kabuto, and the Old Amber will yield an Aerodactyl. Not only are these Pokemon incredibly rare, but their types will help out tremendously in the upcoming gym battle. However, the Pokemon will only be level 30 when they come back to life.
The Cinnabar Gym will be locked the first time you reach the island. You must find the key in the Pokemon Mansion on the northwest corner of the island to challenge the gym. More info on the next page.