>>47655459>Cerulean Cave is kino as hell. Blocked off by an NPC because "you're not strong enough" to keep your interest.not only that, but you can't even reach that NPC on your initial visit. He's plainly visible but because he's on the other side of a river you can't talk to him, he just keeps teasing you with his presence.
Later when you get Surf and think you can finally learn what his deal is, he tells you that he's guarding this super special place but can't let you proceed because you are not strong enough, all fueling the hype.
And now that you are in Cerulean City with the ability to traverse water you might look around for what other secrets you have missed, which might lead you to the abandoned Power Plant which is full of rare pokemon you can't find anywhere else, including a legendary.