you go through it to find the key to the gym
Cinnabar island.
there is no cinnabar island in sapphire. cinnabar is on firered and leafgreen. also in Pokemon yellow special pikachu edition ^_^ don't forget that dude...
Cinnabar mansion
cinnabar island
You can go from Fuscia City through the Seafoam Islands and surf to Cinnabar Island. Or you can go to Pallet Town and surf south to Cinnabar Island.
in the bottom of the Pokemon mansion
It's hinted that Mewtwo is responsible for it; when he got out of control, the mansion was almost destroyed by his power.
The black and yellow caterpillar with spikes is called a "cinnabar moth caterpillar."
it is in the basement in the Pokemon mantion.
Revive the fossil from the scientist in Cinnabar Island.
Sulfur is the element that is yellow and stinks like rotten eggs when burned.
his old gym burned in lava now he is in seafoam island which is directly east from cinnabar