You go to route 24 and use surf then follow the river and go in the cave.If an old grandpa is blocking you're way i think you have to collect all the gym badges or beat red
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if can go to cerulean cave you can
just beat red then go to cerulean city then go to the cave
Go to Cerulean Cave. To get there, you must get the ruby and the sapphire and get the national dex.
just go to the cerulean city cave.
Well, to go to Diglett's Cave, you have to Vermillion City in the Kanto Region.