MT.Ember on the left you will see team rocket,
just beat them both up and explore the cave, eventually ull find the ruby gemstone
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Fire types can be found scattered around the routes of kanto if one area had the most fire types it would be one island.
One Gem is at One island and the other one is at Four Island. this is not true it is near island 6
You go back to the boat you went to One Island in from Vermilion
There is one just south of Cerulean city, in this one you can only raise one of your pokemon. there is another on four island where you can raise two pokemon.
Get the 7th badge from cinnibar island then you will see Bill outside of the gym say YES to his question to be transported to one island!