there is no professor oak in ruby and sapphire
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The ruby and sapphire are on fire red and leaf green don't worry about the in ruby sapphire or emerald.
You have to get the National Pokédex by catching at least 60 different types of Pokémon and talking to Professor Oak, and then deliver the Ruby and Sapphire stones to Celio on Island One. You can then enter Cerulean Cave.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
Ruby/Sapphire/Leaf Green/Fire Red/and i think Emerald. if not, trade from emerald to Ruby/Sapphire, and from ruby/sapphire to leaf green. You need to have the Sapphire and Ruby before you trade. you get these after the elite four.
Professor oak is always in his lab in pallet town.