YoU need to get all 8 gym badges in kanto
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there is no cerulean cave in ruby
yes. you may find them at: Cerulean City Five Island Water Path Cerulean Cave
you cantYou can't get to Mt. Moon from Cerulean City in HG/SS, you have to go through Diglett's Cave and head east from Pewter City.
Unknown Dungeon was the name of a cave in Red, Blue and Yellow version that is located northwest of Cerulean City you would need Surf to reach their the cave is now called Cerulean Cave.
yes you need all 16 badges to get into cerulean cave.