I went to Professor Oak's lab to talk to him along with my rival. Oak upgraded my Pokedex and then I went to Vermilion City. I took the Seagallop ferry to One Island and talked to Celio. He wanted help finding the Ruby and Sapphire items so that the network machine would finally run. I then headed north to the Kindle Road and Ember Spa area of One Island and Surfed all the way to Mt. Ember. I arrived and found that a hole had been dug into the mountain. I entered it and found myself inside the volcano. I encountered a Slugma there and captured it. I finally arrived at the place with the Ruby and I collected it there. I returned it to Celio and I was then allowed to find the Sapphire item on the other Sevii Islands.