there is no cerulean cave in ruby
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Go to Cerulean Cave. To get there, you must get the ruby and the sapphire and get the national dex.
You must 1st beat the game by taking on the Elite Four. Then if you get the ruby and Sapphire so that you can trade with Hoen region (Pokemon Emerald,Saphire,Ruby) then go talk to the guard and you will be able to get in. In cerulean cave you can find Mewtwo if you go the write way and be sure to bring escape ropes.
In Pokémon Ruby Sapphire and Emerald versions, HM7 contains the move waterfall. You can find the HM in the Cave of Origin.
there is no code you need this item called warp island in the cerulean cave after you cach mewtwo
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.