How do you get into cerulean cave on gold?

You can't actually enter Cerulean Cave in Pokemon Gold. It's only accessible in Pokemon Silver and Crystal.

Here's why:

* Storyline Difference: The story in Pokemon Gold focuses on the "Team Rocket" storyline, and Cerulean Cave is not a significant part of it.

* Exclusive Location: Cerulean Cave is specifically designed to be the location where you encounter the legendary Pokemon, Suicune in Pokemon Silver, and Raikou in Pokemon Crystal.

To find these legendary Pokemon, you need to play Pokemon Silver or Crystal.

If you want to experience the Cerulean Cave and the legendary Pokemon, consider playing Pokemon Silver or Crystal!