You have to beat the elite fours,your rival,(note:you must have the national dex for this part)get the ruby from island one to the network machine(also on island one)and the sapphire from island six into the network machine also(ironic because these games came out a year or so after Pokemon ruby and sapphire versions).
there is no cerulean cave in ruby
yes you need all 16 badges to get into cerulean cave.
You can access Cerulean Cave in SoulSilver after you get all 16 gym badges (Johto and Kanto).
You can find mewtwo in the back of cerulean cave.
To get into Cerulean Cave you have to get all 16 badges in Kanto & Johto, beat Red in mt Silver, then talk to Prof. Oak
there is no cerulean cave in ruby
no mewtwo is in cerulean cave and articuno is in seafoam island
There not in cerulean cave.
uh...... if you didn't go into the dark cave in johto and the cave east to cerulean and north of the electric plant. P.S don't mistake the cave in cerulean city. not the cerulean cave!!!!!!!!!!!!!
yes you need all 16 badges to get into cerulean cave.
Cerulean Cave, nor Cerulean City, was not in Pokemon Emerald. In RBY, it opens up after beating the Elite 4.
The cerulean cave is behind that man that says u need all badges to get through. It is in cerulean city
you have to beat the elite four, and get the national dex. then go to cerulean city, go past the nugget bridge, and surf on the water. there is a cave,and its cerulean cave
You cannot catch Mew in the Cerulean Cave because it can't be found there.
You can get all the Pokemon in the cerulean cave where you find celebi below the cerulean cave.
You can find Mewtwo in the back of Cerulean Cave.
The Cerulean Cave is located in the west part of Cerulean City. If you head north, you will notice a water way to the left of the bridge. Surf on that waterway and you will eventually reach Cerulean Cave.