Um, well there is no such version, but to enter the cerulean cave, you must beat the Elite Four + Champ.
there is no cerulean cave in ruby
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.
First defeat the league twice and then enter the cave.
Same as on Red, Green, Blue, Yellow, The original Gold, And Silver versions
You Can Go Into This Cave Once You Have Beaten The Pokemon League. Cerulean Cave Is Where Chanseys And Mewto At LVL 70.
you need to defeat the elite four before you can enter the cave
You have to firs beat elite 4. The cave will open up in Cerulean. Enter the cave, use flash, and navigate your way through. Find MEWTWO and catch him. Cerulean cave is not available in Ruby, Sapphire, and Emerald.
Cerulean Cave can be found just North Of Cerulean heading from Surfing from Route 24. You must have beaten the Elite 4 before you are allowed to enter.
if can go to cerulean cave you can
The Cerulean Cave is in Cerulean City. You have to surf from a place around Cerulean Cape down to the Cerulean Cave. The Cerulean Cape is north of Cerulean City across the bridge.Go to the north end of the nugget bridge then left down the grass and follow the mountain to it. Btw you'll need flash and you can find Mewtwo in it.
You must beat Elite Four... And in the cave near Cerulean is Mewtwo!
maby you have a old version of Pokémon LeafGreen and when it came out , the Cerulean Cave wasn't finished.