How do you get in the cerulean basmant?

you gat all kanto badges

1.Answer.To enter the Cerulean Cave you must first beat the Elite Four, in FR/LG you must also complete the Sevii Island quest to restore the Network Machine. In cerulean city, its the cave across...

You can find Cerulean Cave nearby the golden bridge in Cerulean City. The entrance is on a little patch on land, so you will have to use Surf to reach the cave. You cannot enter the cave until you...

you have to get all the gym badges in kanto

Directly to the right of the exit of Mt. Moon.